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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 are able to measure the time taken for the X to not be seen when seen from above. Sodium thiosulfate reacts with dilute hydrochloric acid to supply sodium chloride, water, sulfur dioxide and sulfur. ( frac {1}{time}) offers a measure of the speed of the response.
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