The times taken for iodine to be liberated in the reaction between sodium thiosulphate and...

JAMB 1987

The times taken for iodine to be liberated in the reaction between sodium thiosulphate and hydrochloric acid at various temperature are as follows. These results suggest that

A. for a 10^o rise in temperature, rate of reaction is double
B. for a 10 ^o rise in temperature, rate of reaction is halved
C. time taken for iodine to appear does not depend on temperature
D. for a 10 ^o rise in temperature rate of reaction is tripled

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Correct Answer: Option B

Explanation

The iodine liberation process is significantly affected by the amount of acid, that of potassium iodide added, the waiting time for the liberation, and light; therefore, the process plays a key role for the accuracy of the titration results.

for a 10 o rise in temperature, rate of reaction is halved

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