The Solubility of Zinc in Sulfuric Acid

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Abstract
An apparatus is described whereby the rate of evolution of hydrogen from zinc in acids can be readily measured. A cone‐shaped cast specimen is used, which, after treating in sodium hydroxide to remove superficial metal, is corroded in 20 per cent sulfuric acid, until a constant surface and a constant rate of gas evolution are attained. The specimen is then tested in dilute sulfuric acid, and the rate of dissolution is expressed in terms of cubic centimeters of hydrogen evolved per minute. The effect of minute additions of impurities is measured, using 99.992 per cent zinc as a base. Of the impurities tested, copper, iron, and antimony have the most pronounced effect, in the order named. Cadmium and lead have only a small effect, and aluminum is practically inert. When very small quantities of gelatin are added to the acid, gas evolution is markedly inhibited. Sodium silicate, on the other hand, has only a slightly inhibiting effect.

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