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Rate of solution of ferrous sulphide in hydrochloric acid solutions Berisford, Robert

Abstract

The rates of solution of laboratory prepared ferrous sulphide in solutions of varying concentrations of hydrochloric acid were measured at three different temperatures, 20, 30 and 40°C. It was found that the rate of solution is not a linear function of the acid concentration but at each through temperature passed thru a maximum at 7.5 N. The reaction was found to be first order in respect to the hydrogen ion concentration and the energy of activation, (with one exception) in the range 0 - 7.5 N was found to be 9700 ± 150 calories per mole. Beyond 7.5 N the energy of activation rises to 16700 calories per mole. Each reaction conforms quite well to the expression k = PZ e[superscript –E/RT] which is the expression proposed by the "Simple Collision Theory". The decrease in rate of solution has been attributed to the absorption of ferrous chloride crystals on the surface of the unreacted sulphide. The mechanisms of solution have been discussed briefly.

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