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Coulometers can be used to determine electric quantities in the direct current circuit, namely the total charge or a constant current. These devices invented by
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were used frequently in the 19th century and in the first half of the 20th century. In the past, the coulometers of that type were named voltameters.
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384:, and related coulometers are either devices used for a coulometry or instruments that perform a coulometry in an automatic way.
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is released at the cathode and collected in a graduated tube so that its volume can be measured. The volume is adjusted to
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These oxidation/reduction processes have 100% efficiency with the wide range of the current densities. Measuring of the
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In this device, mercury is used to determine the amount of charges transformed during the following reaction:
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150:. The cathode is initially massed, current is passed for a measured time and the cathode is massed again.
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by W. E. Ayrton and T. Mather, published by
Cassell and Company, London, 1911, pp 12–26
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of hydrogen is calculated from the volume. This kind of voltameter is sometimes called
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79:, which measures electric potential. The SI unit for electric potential is the
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176:. It is cheaper than the silver voltameter, but slightly less accurate.
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This is similar to the silver voltameter but the anode and cathode are
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used an apparatus that he termed a "volta-electrometer"; subsequently
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Precision
Measurement and Fundamental Constants; Proceedings
64:(quantity of electricity) through electrolytic action. The
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Coulometers can be devices that are used to determine an
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deposition of the mercury ions or decreased during the
287:{\displaystyle {\ce {{Hg2+}+2e-<=>Hg^{\circ }}}}
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United States. National Bureau of
Standards (1971).
142:. When current is flowing, silver dissolves at the
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This is the most accurate type. It consists of two
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500:. U.S. National Bureau of Standards. pp. 138–.
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369:. There can be two goals in measuring charge:
365:. The term comes from the unit of charge, the
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305:) is based on the changes of the mass of the
75:The voltameter should not be confused with a
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118:and the measurement is made by weighing the
376:by measuring the charges. The devices do a
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333:and the solution is dilute sulfuric acid.
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27:Instrument for measuring electric charge
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41:A 19th century version of a voltameter.
474:The correspondence of Michael Faraday
7:
857:Electroanalytical chemistry devices
25:
339:standard temperature and pressure
553:Adsorptive stripping voltammetry
805:Faraday's laws of electrolysis
689:Hanging mercury drop electrode
593:Differential pulse voltammetry
573:Cathodic stripping voltammetry
472:Frank A. J. L. James, (1991),
436:Faraday's laws of electrolysis
264:
239:
1:
628:Rotated electrode voltammetry
122:deposited or released at the
724:Rotating ring-disk electrode
563:Anodic stripping voltammetry
98:called this a "voltameter".
744:Standard hydrogen electrode
734:Saturated calomel electrode
873:
669:Dropping mercury electrode
406:Electrochemical equivalent
329:The anode and cathode are
321:dissolution of the metal.
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68:of electric charge is the
29:
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739:Silver chloride electrode
539:Electroanalytical methods
361:is a device to determine
613:Normal pulse voltammetry
608:Linear sweep voltammetry
380:. This method is called
325:Sulfuric acid voltameter
313:can be increased during
146:and is deposited at the
138:plates in a solution of
30:Not to be confused with
719:Rotating disk electrode
694:Ion selective electrode
309:electrode. Mass of the
299:quantity of electricity
780:Butler–Volmer equation
633:Squarewave voltammetry
603:Hydrodynamic technique
558:Amperometric titration
484:, letter 872, 9/1/1836
426:Equivalent (chemistry)
288:
106:
42:
852:Measuring instruments
795:Debye–Hückel equation
638:Staircase voltammetry
453:Practical Electricity
378:quantitative analysis
289:
126:in a specified time.
114:The voltameter is an
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96:John Frederic Daniell
55:scientific instrument
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832:Analytical Chemistry
775:Activity coefficient
401:Electrochemical cell
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168:and the solution is
749:Ultramicroelectrode
714:Reference electrode
664:Auxiliary electrode
374:amount of substance
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216:
699:Mercury coulometer
588:Cyclic voltammetry
347:Hofmann voltameter
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269:
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186:Mercury coulometer
180:Mercury voltameter
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43:
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790:Cottrell equation
759:Working electrode
679:Electrolytic cell
598:Electrogravimetry
578:Chronoamperometry
568:Bulk electrolysis
431:Equivalent weight
421:Electrolytic cell
276:
271:
227:
205:
172:, acidified with
160:Copper coulometer
154:Copper coulometer
130:Silver voltameter
116:electrolytic cell
16:(Redirected from
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411:Electrochemistry
363:electric charges
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820:Nernst equation
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652:Instrumentation
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389:Michael Faraday
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92:Michael Faraday
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62:electric charge
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815:Ionic strength
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184:Main article:
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170:copper sulfate
158:Main article:
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140:silver nitrate
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810:Half-reaction
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785:Cell notation
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684:Galvanic cell
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623:Potentiometry
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482:0-86341-249-1
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441:Stoichiometry
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174:sulfuric acid
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800:Double layer
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709:Potentiostat
618:Polarography
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416:Electrolysis
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729:Salt bridge
643:Voltammetry
846:Categories
754:Voltameter
659:Amperostat
583:Coulometry
546:Techniques
460:References
382:coulometry
359:coulometer
353:Coulometer
105:Coulometer
51:coulometer
47:voltameter
18:Coulometer
674:Electrode
311:electrode
279:∘
265:⇀
258:−
247:−
240:↽
230:−
87:Etymology
77:voltmeter
59:measuring
57:used for
32:Voltmeter
704:pH meter
395:See also
341:and the
335:Hydrogen
331:platinum
315:cathodic
303:coulombs
476:, IET,
447:Sources
367:coulomb
307:mercury
148:cathode
124:cathode
120:element
70:coulomb
66:SI unit
768:Theory
480:
319:anodic
166:copper
136:silver
144:anode
110:Types
53:is a
478:ISBN
343:mass
81:volt
49:or
848::
357:A
349:.
275:Hg
204:Hg
83:.
72:.
45:A
531:e
524:t
517:v
301:(
226:e
222:2
219:+
213:+
208:2
34:.
20:)
Text is available under the Creative Commons Attribution-ShareAlike License. Additional terms may apply.
