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Henderson–Hasselbalch equation

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is the concentration the hydrogen ion that has been added to the solution. The self-dissociation of water is ignored. A quantity in square brackets, , represents the concentration of the chemical substance X. It is understood that the symbol H stands for the hydrated
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Hasselbalch, K. A. (1917). "Die Berechnung der Wasserstoffzahl des Blutes aus der freien und gebundenen Kohlensäure desselben, und die Sauerstoffbindung des Blutes als Funktion der Wasserstoffzahl".
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is ca. 14 at 25°C. This approximation can be used when the correct value is not known. Thus, the Henderson–Hasselbalch equation can be used, without modification, for bases.
1659:. In these expressions, the quantities in square brackets signify the concentration of the undissociated acid, HA, of the hydrogen ion H, and of the anion A; the quantities 221: 2467: 1563: 209: 1804: 44: 2283:. However, the solubility of carbonic acid in water may be exceeded. When this happens carbon dioxide gas is liberated and the following equation may be used instead. 1677: 1583: 1310: 1274:
the concentration of the sodium ion, can be ignored. This is a good approximation for 1:1 electrolytes, but not for salts of ions that have a higher charge such as
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Lawrence J. Henderson (1908). "Concerning the relationship between the strength of acids and their capacity to preserve neutrality".
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by approximating the actual concentration ratio as the ratio of the analytical concentrations of the acid and of a salt, MA.
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The equation can also be applied to bases by specifying the protonated form of the base as the acid. For example, with an
2183:{\displaystyle {\ce {HCO3-}}+\mathrm {H^{+}} \rightleftharpoons {\ce {H2CO3}}\rightleftharpoons {\ce {CO2}}+{\ce {H2O}}} 212: 2666:
The ABC of Acid-Base Chemistry: The Elements of Physiological Blood-Gas Chemistry for Medical Students and Physicians
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can be ignored. This assumption is not, strictly speaking, valid with pH values close to 7, half the value of pK
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the pH of a biological solution is maintained at a constant value by adjusting the position of the equilibria
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is a mixed equilibrium constant relating to both chemical and solubility equilibria. It can be expressed as
2240: 2196: 1483:{\displaystyle K^{*}={\frac {}{}}\times {\frac {\gamma _{{\ce {H+}}}\gamma _{{\ce {A^-}}}}{\gamma _{HA}}}} 2396: 2434:
represents the carbon dioxide liberated as gas. In this equation, which is widely used in biochemistry,
444: 2577:{\displaystyle \mathrm {pH} =6.1+\log _{10}\left({\frac {}{0.0307\times P_{\mathrm {CO} _{2}}}}\right)} 312:{\displaystyle \mathrm {{\underset {(acid)}{HA}}\leftrightharpoons {\underset {(base)}{A^{-}}}+H^{+}} } 2027: 1105: 2752: 1680: 142: 2742:
Po, Henry N.; Senozan, N. M. (2001). "Henderson–Hasselbalch Equation: Its History and Limitations".
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Rearrangement of this expression and taking logarithms provides the Henderson–Hasselbalch equation
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The Henderson–Hasselbalch equation can be applied to a polybasic acid only if its consecutive p
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Skoog, Douglas A.; West, Donald M.; Holler, F. James; Crouch, Stanley R. (2004).
1652:{\displaystyle {\frac {\gamma _{{\ce {H+}}}\gamma _{{\ce {A^-}}}}{\gamma _{HA}}}} 416:{\displaystyle \mathrm {CH_{3}CO_{2}H\leftrightharpoons CH_{3}CO_{2}^{-}+H^{+}} } 2234: 2065: 571: 323: 1312:, is a constant under the experimental conditions covered by the calculations. 1264:{\displaystyle \mathrm {Na(CH_{3}CO_{2})\rightarrow Na^{+}+CH_{3}CO_{2}^{-}} } 619:
To derive the equation a number of simplifying assumptions have to be made.
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where is the molar concentration of bicarbonate in the blood plasma and
1283: 625:: The acid, HA, is monobasic and dissociates according to the equations 2764: 1158:: The salt MA is completely dissociated in solution. For example, with 2688:
Petrucci, Ralph H.; Harwood, William S.; Herring, F. Geoffrey (2002).
543:{\displaystyle \mathrm {RNH_{3}^{+}\leftrightharpoons RNH_{2}+H^{+}} } 2619:
derived an equation to calculate the hydrogen ion concentration of a
2014:{\displaystyle \mathrm {pK_{a}=\mathrm {pK_{w}} -\mathrm {pK_{b}} } } 2718:(8th ed.). Belmont, Ca (USA): Brooks/Cole. pp. 251–263. 595: 438: 593:
of the acid, and the concentrations of the species in solution.
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of a solution containing a mixture of the two components to the
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The Henderson–Hasselbalch equation can be used to estimate the
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The equilibrium constant for the protonation of a base, B,
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Equation used to estimate pH of a weak acid or base solution
2670:(Sixth ed.). Chicago: The University of Chicago Press. 1791:{\displaystyle K_{a}={\frac {K^{*}}{\Gamma }}={\frac {}{}}} 579: 427: 138: 2173: 2155: 2137: 2124: 2641:
terms, resulting in the Henderson–Hasselbalch equation.
2141: 2110: 1690:can be expressed as a quotient of concentrations. 660: 2470: 2440: 2399: 2292: 2243: 2199: 2077: 2030: 1959: 1807: 1699: 1665: 1591: 1571: 1499: 1351: 1321: 1298: 1170: 1108: 973: 819: 720: 634: 484: 447: 334: 224: 170: 47: 2712:For details and worked examples see, for instance, 2663: 2576: 2453: 2426: 2383: 2271: 2225: 2182: 2048: 2013: 1896: 1790: 1671: 1651: 1577: 1557: 1482: 1334: 1304: 1263: 1144: 1091: 903: 804: 705: 542: 468: 415: 311: 203: 129: 918:is the analytical concentration of the acid and C 668: 667: 650: 649: 578:. The Henderson–Hasselbalch equation relates the 1092:{\displaystyle \mathrm {C_{H}=+/K_{a}+K_{w}/} } 706:{\displaystyle {\ce {HA <=> H^+ + A^-}}} 2633:introduced the pH terminology, which allowed 1493:is a product of a quotient of concentrations 8: 2692:(8th ed.). Prentice Hall. p. 718. 2623:solution, which rearranged looks like this: 2384:{\displaystyle \mathrm {} =\mathrm {K^{m}} } 570:of the acid. For example, the acid may be 2559: 2551: 2549: 2528: 2523: 2512: 2505: 2492: 2471: 2469: 2445: 2439: 2408: 2400: 2398: 2362: 2346: 2341: 2328: 2323: 2301: 2293: 2291: 2262: 2249: 2244: 2242: 2216: 2211: 2200: 2198: 2172: 2167: 2162: 2154: 2149: 2144: 2136: 2131: 2123: 2118: 2113: 2103: 2098: 2088: 2083: 2078: 2076: 2039: 2031: 2029: 2003: 1995: 1985: 1977: 1968: 1960: 1958: 1879: 1864: 1859: 1853: 1840: 1826: 1825: 1816: 1808: 1806: 1777: 1762: 1757: 1744: 1739: 1733: 1719: 1713: 1704: 1698: 1664: 1638: 1624: 1619: 1618: 1605: 1600: 1599: 1592: 1590: 1570: 1544: 1529: 1524: 1511: 1506: 1500: 1498: 1469: 1455: 1450: 1449: 1436: 1431: 1430: 1423: 1409: 1394: 1389: 1376: 1371: 1365: 1356: 1350: 1326: 1320: 1297: 1292:: The quotient of activity coefficients, 1254: 1249: 1236: 1220: 1201: 1188: 1171: 1169: 1132: 1120: 1114: 1109: 1107: 1079: 1067: 1061: 1048: 1039: 1030: 1014: 995: 979: 974: 972: 894: 885: 876: 860: 841: 825: 820: 818: 795: 786: 777: 761: 742: 726: 721: 719: 696: 683: 669: 662: 661: 659: 651: 644: 642: 641: 639: 635: 633: 604:of an acidified solution of a weak acid ( 533: 520: 501: 496: 485: 483: 459: 448: 446: 406: 393: 388: 375: 356: 343: 335: 333: 302: 267: 261: 226: 225: 223: 190: 177: 171: 169: 112: 99: 93: 80: 66: 65: 56: 48: 46: 1315:The thermodynamic equilibrium constant, 1152:can be omitted to a good approximation. 904:{\displaystyle \mathrm {C_{H}=+/K_{a}} } 805:{\displaystyle \mathrm {C_{A}=+/K_{a}} } 2680: 643: 554:Derivation, assumptions and limitations 2637:to re-express Henderson's equation in 2272:{\displaystyle \mathrm {H_{2}CO_{3}} } 2226:{\displaystyle \mathrm {HCO_{3}^{-}} } 164:and the ratio of the concentrations, 7: 2737: 2735: 2716:Fundamentals of Analytical Chemistry 2427:{\displaystyle \mathrm {CO_{2}(g)} } 2555: 2552: 2519: 2516: 2513: 2475: 2472: 2417: 2405: 2401: 2371: 2359: 2355: 2347: 2343: 2320: 2316: 2313: 2298: 2259: 2255: 2246: 2208: 2204: 2201: 2100: 2040: 2036: 2032: 2004: 2000: 1996: 1986: 1982: 1978: 1969: 1965: 1961: 1725: 1572: 1299: 1246: 1242: 1233: 1229: 1217: 1213: 1198: 1194: 1185: 1181: 1175: 1172: 1129: 1115: 1111: 1076: 1062: 1058: 1049: 1045: 1027: 1011: 992: 980: 976: 895: 891: 873: 857: 838: 826: 822: 796: 792: 774: 758: 739: 727: 723: 530: 517: 513: 510: 493: 489: 486: 469:{\displaystyle \mathrm {RNH_{2}} } 456: 452: 449: 403: 385: 381: 372: 368: 362: 353: 349: 340: 336: 299: 286: 283: 280: 277: 264: 249: 246: 243: 240: 232: 229: 25: 2049:{\displaystyle \mathrm {pK_{w}} } 1145:{\displaystyle \mathrm {K_{w}/} } 2793:10.1152/ajplegacy.1908.21.2.173 2841:Eponymous equations of physics 2534: 2508: 2420: 2414: 2377: 2374: 2368: 2352: 2334: 2310: 2307: 2294: 1884: 1876: 1871: 1856: 1782: 1774: 1769: 1754: 1751: 1736: 1549: 1541: 1536: 1521: 1518: 1503: 1414: 1406: 1401: 1386: 1383: 1368: 1210: 1207: 1178: 1138: 1125: 1085: 1072: 1036: 1023: 1020: 1007: 1001: 988: 882: 869: 866: 853: 847: 834: 783: 770: 767: 754: 748: 735: 670: 645: 507: 365: 289: 274: 258: 252: 237: 195: 187: 182: 174: 149:to the numerical value of the 117: 109: 104: 96: 40:Henderson–Hasselbalch equation 18:Henderson-Hasselbalch equation 1: 2662:Davenport, Horace W. (1974). 942:values differ by at least 3. 562:consists of a solution of an 322:For example, the acid may be 2631:Søren Peter Lauritz Sørensen 1943:is an association constant, 1558:{\displaystyle {\frac {}{}}} 204:{\displaystyle {\frac {}{}}} 1585:, of activity coefficients 2867: 933:acid dissociation constant 584:acid dissociation constant 151:acid dissociation constant 2617:Lawrence Joseph Henderson 2809:Biochemische Zeitschrift 2607:in the supernatant gas. 962:self-ionization of water 954:self-ionization of water 2851:Mathematics in medicine 2635:Karl Albert Hasselbalch 2060:Biological applications 1672:{\displaystyle \gamma } 1578:{\displaystyle \Gamma } 1305:{\displaystyle \Gamma } 2578: 2455: 2428: 2385: 2273: 2227: 2184: 2050: 2015: 1898: 1792: 1679:are the corresponding 1673: 1653: 1579: 1559: 1484: 1336: 1306: 1265: 1146: 1093: 905: 806: 707: 616: 544: 470: 417: 313: 205: 131: 2846:Equilibrium chemistry 2579: 2456: 2454:{\displaystyle K^{m}} 2429: 2386: 2274: 2228: 2185: 2051: 2016: 1899: 1793: 1681:activity coefficients 1674: 1654: 1580: 1560: 1485: 1337: 1335:{\displaystyle K^{*}} 1307: 1266: 1147: 1094: 906: 807: 708: 599: 545: 471: 418: 314: 206: 132: 2468: 2438: 2397: 2290: 2241: 2197: 2075: 2028: 1957: 1907:Application to bases 1805: 1697: 1663: 1589: 1569: 1497: 1349: 1319: 1296: 1168: 1106: 971: 817: 718: 632: 574:and the salt may be 482: 445: 332: 222: 215:in an equilibrium. 211:of the acid and its 168: 45: 2836:Acid–base chemistry 2757:2001JChEd..78.1499P 2533: 2333: 2221: 2175: 2157: 2139: 2126: 2093: 1259: 960:, the constant for 656: 506: 398: 2765:10.1021/ed078p1499 2621:bicarbonate buffer 2574: 2511: 2451: 2424: 2381: 2319: 2269: 2223: 2207: 2180: 2163: 2145: 2127: 2114: 2079: 2046: 2011: 1894: 1788: 1669: 1649: 1575: 1555: 1480: 1332: 1302: 1276:magnesium sulphate 1261: 1245: 1142: 1102:However, the term 1089: 901: 802: 703: 675: 617: 566:and a salt of the 540: 492: 466: 413: 384: 309: 293: 256: 201: 127: 2751:(11): 1499–1503. 2690:General Chemistry 2651:Davenport diagram 2568: 2178: 2166: 2148: 2130: 2117: 2082: 1888: 1882: 1863: 1829: 1819: 1811: 1786: 1780: 1761: 1743: 1728: 1647: 1623: 1604: 1553: 1547: 1528: 1510: 1478: 1454: 1435: 1418: 1412: 1393: 1375: 946:is such an acid. 695: 682: 677: 638: 262: 227: 199: 193: 180: 143:chemical solution 121: 115: 102: 69: 59: 51: 16:(Redirected from 2858: 2818: 2817: 2803: 2797: 2796: 2775: 2769: 2768: 2739: 2730: 2729: 2710: 2704: 2703: 2685: 2671: 2669: 2601:partial pressure 2598: 2583: 2581: 2580: 2575: 2573: 2569: 2567: 2566: 2565: 2564: 2563: 2558: 2537: 2532: 2527: 2522: 2506: 2497: 2496: 2478: 2460: 2458: 2457: 2452: 2450: 2449: 2433: 2431: 2430: 2425: 2423: 2413: 2412: 2390: 2388: 2387: 2382: 2380: 2367: 2366: 2351: 2350: 2337: 2332: 2327: 2306: 2305: 2278: 2276: 2275: 2270: 2268: 2267: 2266: 2254: 2253: 2232: 2230: 2229: 2224: 2222: 2220: 2215: 2189: 2187: 2186: 2181: 2179: 2176: 2174: 2171: 2164: 2158: 2156: 2153: 2146: 2140: 2138: 2135: 2128: 2125: 2122: 2115: 2109: 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J. Physiol. 2777: 2776: 2772: 2741: 2740: 2733: 2726: 2713: 2711: 2707: 2700: 2687: 2686: 2682: 2677: 2661: 2659: 2657:Further reading 2647: 2627: 2613: 2597: 2596: 2588: 2550: 2545: 2538: 2507: 2501: 2488: 2466: 2465: 2441: 2436: 2435: 2404: 2395: 2394: 2358: 2342: 2297: 2288: 2287: 2258: 2245: 2239: 2238: 2195: 2194: 2099: 2073: 2072: 2062: 2035: 2026: 2025: 1999: 1981: 1964: 1955: 1954: 1949: 1934: 1933: 1930: 1929: 1928: 1921: 1920: 1917: 1916: 1915: 1909: 1875: 1860: 1855: 1849: 1836: 1821: 1803: 1802: 1773: 1758: 1740: 1735: 1715: 1700: 1695: 1694: 1689: 1661: 1660: 1634: 1620: 1614: 1601: 1595: 1594: 1587: 1586: 1567: 1566: 1540: 1525: 1507: 1502: 1495: 1494: 1465: 1451: 1445: 1432: 1426: 1425: 1405: 1390: 1372: 1367: 1352: 1347: 1346: 1322: 1317: 1316: 1294: 1293: 1281: 1232: 1216: 1197: 1184: 1166: 1165: 1128: 1110: 1104: 1103: 1075: 1057: 1044: 1026: 1010: 991: 975: 969: 968: 959: 944:Phosphoric acid 930: 921: 917: 890: 872: 856: 837: 821: 815: 814: 791: 773: 757: 738: 722: 716: 715: 692: 679: 630: 629: 612: 605: 592: 560:buffer solution 556: 529: 516: 480: 479: 455: 443: 442: 432:buffer solution 402: 371: 352: 339: 330: 329: 298: 273: 263: 236: 228: 220: 219: 186: 173: 166: 165: 159: 108: 95: 89: 76: 61: 43: 42: 28: 23: 22: 15: 12: 11: 5: 2864: 2862: 2854: 2853: 2848: 2843: 2838: 2828: 2827: 2820: 2819: 2798: 2787:(2): 173–179. 2770: 2745:J. Chem. Educ. 2731: 2724: 2705: 2698: 2679: 2678: 2676: 2673: 2658: 2655: 2654: 2653: 2646: 2643: 2625: 2612: 2609: 2605:carbon dioxide 2594: 2592: 2585: 2584: 2572: 2562: 2557: 2554: 2548: 2544: 2541: 2536: 2531: 2526: 2521: 2518: 2515: 2510: 2504: 2500: 2495: 2491: 2487: 2484: 2481: 2477: 2474: 2448: 2444: 2422: 2419: 2416: 2411: 2407: 2403: 2392: 2391: 2379: 2376: 2373: 2370: 2365: 2361: 2357: 2354: 2349: 2345: 2340: 2336: 2331: 2326: 2322: 2318: 2315: 2312: 2309: 2304: 2300: 2296: 2265: 2261: 2257: 2252: 2248: 2219: 2214: 2210: 2206: 2203: 2191: 2190: 2170: 2161: 2152: 2143: 2134: 2121: 2112: 2106: 2102: 2097: 2091: 2086: 2061: 2058: 2042: 2038: 2034: 2022: 2021: 2006: 2002: 1998: 1994: 1988: 1984: 1980: 1976: 1971: 1967: 1963: 1947: 1941: 1940: 1908: 1905: 1892: 1886: 1878: 1873: 1867: 1858: 1852: 1848: 1843: 1839: 1835: 1824: 1815: 1799: 1798: 1784: 1776: 1771: 1765: 1756: 1753: 1747: 1738: 1732: 1727: 1722: 1718: 1712: 1707: 1703: 1687: 1668: 1644: 1641: 1637: 1627: 1617: 1608: 1598: 1574: 1551: 1543: 1538: 1532: 1523: 1520: 1514: 1505: 1491: 1490: 1475: 1472: 1468: 1458: 1448: 1439: 1429: 1422: 1416: 1408: 1403: 1397: 1388: 1385: 1379: 1370: 1364: 1359: 1355: 1329: 1325: 1301: 1279: 1272: 1271: 1257: 1252: 1248: 1244: 1239: 1235: 1231: 1228: 1223: 1219: 1215: 1212: 1209: 1204: 1200: 1196: 1191: 1187: 1183: 1180: 1177: 1174: 1160:sodium acetate 1140: 1135: 1131: 1127: 1123: 1117: 1113: 1100: 1099: 1087: 1082: 1078: 1074: 1070: 1064: 1060: 1056: 1051: 1047: 1042: 1038: 1033: 1029: 1025: 1022: 1017: 1013: 1009: 1006: 1003: 998: 994: 990: 987: 982: 978: 957: 928: 919: 915: 912: 911: 897: 893: 888: 884: 879: 875: 871: 868: 863: 859: 855: 852: 849: 844: 840: 836: 833: 828: 824: 812: 798: 794: 789: 785: 780: 776: 772: 769: 764: 760: 756: 753: 750: 745: 741: 737: 734: 729: 725: 713: 699: 691: 686: 672: 665: 654: 647: 610: 590: 576:sodium acetate 568:conjugate base 555: 552: 551: 550: 536: 532: 528: 523: 519: 515: 512: 509: 504: 499: 495: 491: 488: 462: 458: 454: 451: 424: 423: 409: 405: 401: 396: 391: 387: 383: 378: 374: 370: 367: 364: 359: 355: 351: 346: 342: 338: 320: 319: 305: 301: 297: 291: 288: 285: 282: 279: 276: 270: 266: 260: 254: 251: 248: 245: 242: 239: 234: 231: 213:conjugate base 197: 189: 184: 176: 157: 125: 119: 111: 106: 98: 92: 88: 83: 79: 75: 64: 55: 26: 24: 14: 13: 10: 9: 6: 4: 3: 2: 2863: 2852: 2849: 2847: 2844: 2842: 2839: 2837: 2834: 2833: 2831: 2824: 2815: 2811: 2810: 2802: 2799: 2794: 2790: 2786: 2783: 2782: 2774: 2771: 2766: 2762: 2758: 2754: 2750: 2747: 2746: 2738: 2736: 2732: 2727: 2721: 2717: 2709: 2706: 2701: 2699:0-13-014329-4 2695: 2691: 2684: 2681: 2674: 2672: 2668: 2667: 2656: 2652: 2649: 2648: 2644: 2642: 2640: 2636: 2632: 2624: 2622: 2618: 2610: 2608: 2606: 2602: 2591: 2570: 2560: 2546: 2542: 2539: 2529: 2524: 2502: 2498: 2493: 2489: 2485: 2482: 2479: 2464: 2463: 2462: 2446: 2442: 2409: 2363: 2338: 2329: 2324: 2302: 2286: 2285: 2284: 2282: 2281:carbonic acid 2263: 2250: 2236: 2217: 2212: 2168: 2159: 2150: 2132: 2119: 2104: 2095: 2089: 2084: 2071: 2070: 2069: 2067: 2059: 2057: 2024:The value of 1992: 1974: 1953: 1952: 1951: 1946: 1914: 1913: 1912: 1906: 1904: 1890: 1865: 1850: 1846: 1841: 1837: 1833: 1822: 1813: 1763: 1745: 1730: 1720: 1716: 1710: 1705: 1701: 1693: 1692: 1691: 1686: 1682: 1666: 1642: 1639: 1635: 1625: 1615: 1606: 1596: 1530: 1512: 1473: 1470: 1466: 1456: 1446: 1437: 1427: 1420: 1395: 1377: 1362: 1357: 1353: 1345: 1344: 1343: 1327: 1323: 1313: 1291: 1287: 1285: 1277: 1255: 1250: 1237: 1226: 1221: 1202: 1189: 1164: 1163: 1162: 1161: 1157: 1153: 1133: 1121: 1080: 1068: 1054: 1040: 1031: 1015: 1004: 996: 985: 967: 966: 965: 963: 955: 951: 947: 945: 941: 936: 934: 926: 886: 877: 861: 850: 842: 831: 813: 787: 778: 762: 751: 743: 732: 714: 697: 689: 684: 663: 652: 628: 627: 626: 624: 620: 615:) with alkali 609: 603: 598: 594: 589: 585: 581: 577: 573: 569: 565: 561: 553: 534: 526: 521: 502: 497: 478: 477: 476: 460: 440: 435: 433: 429: 407: 399: 394: 389: 376: 357: 344: 328: 327: 326: 325: 303: 295: 268: 218: 217: 216: 214: 163: 156: 152: 148: 144: 140: 123: 90: 86: 81: 77: 73: 62: 53: 41: 37: 33: 19: 2823: 2813: 2807: 2801: 2784: 2779: 2773: 2748: 2743: 2725:0-03035523-0 2715: 2708: 2689: 2683: 2665: 2660: 2628: 2614: 2589: 2586: 2393: 2192: 2063: 2023: 1944: 1942: 1910: 1800: 1684: 1492: 1314: 1290:Assumption 4 1289: 1288: 1282:, that form 1273: 1156:Assumption 3 1155: 1154: 1101: 950:Assumption 2 949: 948: 939: 937: 913: 623:Assumption 1 622: 621: 618: 607: 587: 557: 436: 425: 321: 154: 137:relates the 39: 36:biochemistry 29: 2639:logarithmic 2235:bicarbonate 2066:homeostasis 572:acetic acid 324:acetic acid 2830:Categories 2816:: 112–144. 2675:References 600:Simulated 2615:In 1908, 2543:× 2530:− 2499:⁡ 2330:− 2218:− 2142:⇌ 2111:⇌ 2090:− 1993:− 1866:− 1847:⁡ 1764:− 1726:Γ 1721:∗ 1667:γ 1636:γ 1626:− 1616:γ 1597:γ 1573:Γ 1531:− 1467:γ 1457:− 1447:γ 1428:γ 1421:× 1396:− 1358:∗ 1328:∗ 1300:Γ 1284:ion pairs 1256:− 1211:→ 1032:− 925:hydronium 878:− 779:− 744:− 698:− 671:⇀ 664:− 653:− 646:↽ 602:titration 558:A simple 508:⇋ 395:− 366:⇋ 269:− 259:⇋ 147:weak acid 87:⁡ 32:chemistry 2645:See also 2629:In 1909 2237:ion and 2753:Bibcode 2611:History 2599:is the 2233:is the 2722:  2696:  2540:0.0307 2193:where 1935:(acid) 1927:+ H ⇌ 1922:(base) 1278:, MgSO 952:. The 931:is an 927:ion. K 38:, the 2626:= K 2064:With 613:= 4.7 439:amine 430:of a 160:, of 145:of a 141:of a 2720:ISBN 2694:ISBN 1286:. 564:acid 192:Acid 179:Base 162:acid 114:Acid 101:Base 34:and 2789:doi 2761:doi 2603:of 2490:log 2483:6.1 2279:is 2081:HCO 1838:log 1342:, 78:log 30:In 2832:: 2814:78 2812:. 2785:21 2759:. 2749:78 2734:^ 2593:CO 2494:10 2147:CO 2129:CO 1931:BH 1881:HA 1842:10 1810:pH 1779:HA 1546:HA 1411:HA 935:. 637:HA 586:, 580:pH 441:, 428:pH 153:, 139:pH 82:10 50:pH 2795:. 2791:: 2767:. 2763:: 2755:: 2728:. 2702:. 2595:2 2590:P 2571:) 2561:2 2556:O 2553:C 2547:P 2535:] 2525:3 2520:O 2517:C 2514:H 2509:[ 2503:( 2486:+ 2480:= 2476:H 2473:p 2447:m 2443:K 2421:) 2418:g 2415:( 2410:2 2406:O 2402:C 2378:] 2375:) 2372:g 2369:( 2364:2 2360:O 2356:C 2353:[ 2348:m 2344:K 2339:= 2335:] 2325:3 2321:O 2317:C 2314:H 2311:[ 2308:] 2303:+ 2299:H 2295:[ 2264:3 2260:O 2256:C 2251:2 2247:H 2213:3 2209:O 2205:C 2202:H 2177:O 2169:2 2165:H 2160:+ 2151:2 2133:3 2120:2 2116:H 2105:+ 2101:H 2096:+ 2085:3 2041:w 2037:K 2033:p 2005:b 2001:K 1997:p 1987:w 1983:K 1979:p 1975:= 1970:a 1966:K 1962:p 1948:b 1945:K 1918:B 1891:) 1885:] 1877:[ 1872:] 1862:A 1857:[ 1851:( 1834:+ 1828:a 1823:K 1818:p 1814:= 1783:] 1775:[ 1770:] 1760:A 1755:[ 1752:] 1746:+ 1742:H 1737:[ 1731:= 1717:K 1711:= 1706:a 1702:K 1688:a 1685:K 1643:A 1640:H 1622:A 1607:+ 1603:H 1550:] 1542:[ 1537:] 1527:A 1522:[ 1519:] 1513:+ 1509:H 1504:[ 1474:A 1471:H 1453:A 1438:+ 1434:H 1415:] 1407:[ 1402:] 1392:A 1387:[ 1384:] 1378:+ 1374:H 1369:[ 1363:= 1354:K 1324:K 1280:4 1251:2 1247:O 1243:C 1238:3 1234:H 1230:C 1227:+ 1222:+ 1218:a 1214:N 1208:) 1203:2 1199:O 1195:C 1190:3 1186:H 1182:C 1179:( 1176:a 1173:N 1139:] 1134:+ 1130:H 1126:[ 1122:/ 1116:w 1112:K 1086:] 1081:+ 1077:H 1073:[ 1069:/ 1063:w 1059:K 1055:+ 1050:a 1046:K 1041:/ 1037:] 1028:A 1024:[ 1021:] 1016:+ 1012:H 1008:[ 1005:+ 1002:] 997:+ 993:H 989:[ 986:= 981:H 977:C 958:w 940:K 929:a 920:H 916:A 914:C 896:a 892:K 887:/ 883:] 874:A 870:[ 867:] 862:+ 858:H 854:[ 851:+ 848:] 843:+ 839:H 835:[ 832:= 827:H 823:C 797:a 793:K 788:/ 784:] 775:A 771:[ 768:] 763:+ 759:H 755:[ 752:+ 749:] 740:A 736:[ 733:= 728:A 724:C 694:A 690:+ 685:+ 681:H 611:a 608:K 606:p 591:a 588:K 535:+ 531:H 527:+ 522:2 518:H 514:N 511:R 503:+ 498:3 494:H 490:N 487:R 461:2 457:H 453:N 450:R 408:+ 404:H 400:+ 390:2 386:O 382:C 377:3 373:H 369:C 363:H 358:2 354:O 350:C 345:3 341:H 337:C 304:+ 300:H 296:+ 290:) 287:e 284:s 281:a 278:b 275:( 265:A 253:) 250:d 247:i 244:c 241:a 238:( 233:A 230:H 196:] 188:[ 183:] 175:[ 158:a 155:K 124:) 118:] 110:[ 105:] 97:[ 91:( 74:+ 68:a 63:K 58:p 54:= 20:)

Index

Henderson-Hasselbalch equation
chemistry
biochemistry
pH
chemical solution
weak acid
acid dissociation constant
acid
conjugate base
acetic acid
pH
buffer solution
amine
buffer solution
acid
conjugate base
acetic acid
sodium acetate
pH
acid dissociation constant

titration
hydronium
acid dissociation constant
Phosphoric acid
self-ionization of water
self-ionization of water
sodium acetate
magnesium sulphate
ion pairs

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