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The Bichromate Cell

المؤلف:  GEORGE A. HOADLEY

المصدر:  ESSENTIALS OF PHYSICS

الجزء والصفحة:  p-352

2025-12-28

548

In the bichromate cell and the chromic  acid cell the chemical action upon  the zinc goes on vigorously whether the circuit is open or closed, and for this reason the zinc is so arranged that it can be raised out of the liquid when the  current is not needed. A common form is that known as the bottle form, shown in Fig. 1. Two plates of carbon are suspended from the top of the bottle, while between them is a rod carrying at its lower end a zinc plate that can be raised and lowered at will. 

The solution used may be either potassium bichromate or chromic acid, but the latter is the more convenient to make.

Chromic Acid Solution. - Dissolve 160 g. of chromic acid in 1420 c.c. of water, and add slowly, stirring all the while, 90 c.c. of sulphuric acid.