Rate of reaction

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Question 15
Medium

Ammonium thiosulfate solution reacts with dilute sulfuric acid to produce a cloudy mixture.

a.

The chemical equation for this reaction is: (NH4)2S2O3(aq)+H2SO4(aq)→(NH4)2SO4(aq)+SO2(g)+H2O(l)+S(s)\mathrm{(NH_4)_2S_2O_3(aq) + H_2SO_4(aq) \rightarrow (NH_4)_2SO_4(aq) + SO_2(g) + H_2O(l) + S(s)}(NH4​)2​S2​O3​(aq)+H2​SO4​(aq)→(NH4​)2​SO4​(aq)+SO2​(g)+H2​O(l)+S(s) Explain why the mixture becomes cloudy.

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b.

Plan an investigation to show how the concentration of the ammonium thiosulfate solution affects the rate of this reaction. Your method should produce valid, reproducible results.

The experimental setup is shown below:

Experimental setup of the disappearing cross reaction

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