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Rates of reaction

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Question 10

A student investigates the rate of reaction between sodium thiosulfate solution, Na2S2O3\text{Na}_2\text{S}_2\text{O}_3Na2​S2​O3​, and dilute nitric acid, HNO3\text{HNO}_3HNO3​.

Na2S2O3(aq)+2HNO3(aq)→2NaNO3(aq)+H2O(l)+SO2(g)+S(s) \text{Na}_2\text{S}_2\text{O}_3(\text{aq}) + 2\text{HNO}_3(\text{aq}) \rightarrow 2\text{NaNO}_3(\text{aq}) + \text{H}_2\text{O}(\text{l}) + \text{SO}_2(\text{g}) + \text{S}(\text{s}) Na2​S2​O3​(aq)+2HNO3​(aq)→2NaNO3​(aq)+H2​O(l)+SO2​(g)+S(s)

During the reaction, the clear reactants are mixed together and the mixture gradually becomes cloudy.

Explain why the mixture turns cloudy.

[2]

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