A century and a half of silver-based coulometry

Stock, John T.

doi:10.1021/ed069p949

Cited by 6 publications

(7 citation statements)

References 12 publications

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“…Dies änderte sich mit der Bestimmung der Elementarladung (e = 1,602 ⋅ 10 –19 C) durch den Milikan‐Versuch im Jahr 1917, anhand dessen sich die Avogadro‐Konstante als Quotient der Faraday‐Konstante und eben jener Elementarladung bestimmen lässt. Historisch wurde die Faraday‐Konstante bei bekanntem Ladungstransfer über die Massenzunahme von Elektroden ermittelt [4], eine Methode, die auch heute noch funktioniert:…”

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Bestimmung der Avogadro‐Konstante

Wunsch¹,

Geue²

2020

Chemie in nserer Zeit

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In der vorliegenden Aufgabe wird die Avogadro‐Konstante thematisiert, wobei drei verschiedene Möglichkeiten ihrer Bestimmung im Wettbewerbscharakter vorgestellt werden [1]: eine historische, eher ungenaue Methode, sowie die präzisere, moderne Art der Ermittlung. Ergänzt werden die beiden Ansätze durch den Ölfleckversuch, der mit wenigen Utensilien und ohne großen Aufwand zu Hause durchführbar ist und ebenfalls ein Ergebnis in der richtigen Größenordnung liefert.

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Section: Abbunclassified

Bestimmung der Avogadro‐Konstante

Wunsch¹,

Geue²

2020

Chemie in nserer Zeit

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“…As an added irony, the Faraday constant, now known to within a few parts per million, is based on the silver voltameter. Nobel Laureate Theodore William Richards (1868-1928) was one of the many who successively improved the precision of the silver voltameter (30). In 1902 he suggested that the anachronistic term, voltameter, should be replaced by the descriptive term, coulometer.…”

Section: Electrochemistrymentioning

confidence: 99%

A backward look at scientific instrumentation

Stock¹

1993

Anal. Chem.

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“…Electrolysis of water and stoichiometry of redox reactions are essential to high school and undergraduate chemistry courses. Many reports − demonstrate the electrolysis of water and its pedagogical significance in chemistry. Traditionally, Hofmann apparatus or similar handmade devices have been used to demonstrate the relative proportion of gases produced as a result of the electrolysis process. − ,,− ,,,,− Several indicators have been used to colorfully illustrate ,,,,− the pH changes during the electrolysis process.…”

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Using Mole Ratios of Electrolytic Products of Water for Analysis of Household Vinegar: An Experiment for the Undergraduate Physical Chemistry Laboratory

Dabke

Gebeyehu

2012

J. Chem. Educ.

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A simple 3-h physical chemistry undergraduate experiment for the quantitative analysis of acetic acid in household vinegar is presented. The laboratory experiment combines titration concept with electrolysis and an application of the gas laws. A vinegar sample was placed in the cathode compartment of the electrolysis cell. Electrolysis of water generated OH − (aq) in the cathode compartment. Acetic acid in the vinegar sample was neutralized by electrolytically generated OH − (aq). Phenolphthalein was used as a visual indicator to detect the end point of the titration. The volume of O 2 (g) produced at the anode was monitored. The amount of OH − (aq) produced at the cathode was determined from the volume of O 2 (g) produced at the anode. The amount of acetic acid present in the sample was determined from the mole relationships between H + (aq), OH − (aq), and O 2 (g). The concentration of acetic acid in household vinegar was determined to be 4.8%. The experimentally determined percentage of acetic acid was in agreement with the manufacturer's label and the volumetric titration results. The electrolysis cell was directly powered by a 9 V battery. Preparation of an electrolysis cell, experimental procedure, and results of the electrolytic titration are presented.

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A century and a half of silver-based coulometry

Abstract: History of silver-based coulometry.

Cited by 6 publications

References 12 publications

Bestimmung der Avogadro‐Konstante

Bestimmung der Avogadro‐Konstante

A backward look at scientific instrumentation

Using Mole Ratios of Electrolytic Products of Water for Analysis of Household Vinegar: An Experiment for the Undergraduate Physical Chemistry Laboratory

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