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Zinc Metal And Hydrochloric Acid

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Charges of response – (CCEA)

Calcium carbonate with dilute acid

CaCO3+ HCl → CaCl2 + CO2 + H2O

Catalytic decomposition of hydrogen peroxide

2H2O2 → O2 + 2H2O

Sodium thiosulfate with acid

The sulfur makes the answer change to opaque and if the conical flask is positioned over an X drawn on a bit of paper we will measure the time taken for the X to not be seen when considered from above. Sodium thiosulfate reacts with dilute hydrochloric acid to supply sodium chloride, water, sulfur dioxide and sulfur. ( frac {1}{time}) provides a measure of the speed of the response.

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