Reaction between sodium thiosulphate and hydrochloric acid

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I am going to investigate how a change in concentration affects the reaction rate between Sodium Thiosulphate and Hydrochloric acid. The chemical equation for the experiment is as below;

Na2S2O3 + 2HCl 2NaCl + H2O + S + SO2

Ø When pouring the acid, make sure it is done above eye level. Hydrochloric acid is also an irritant, so goggles could be used.

Ø Always wash your hands after doing an experiment, especially ones with irritant.

Ø The reaction gives off Sulphur Dioxide, which is a highly acidic gas, so as soon as the reaction has finishes, it all needs to be washed down the sink with plenty of water.

Ø Two small 100cm3 beakers, for the Sodium Thiosulphate and Hydrochloric acid

Ø A small 100cm3 conical flask to mix the fluids in

Ø A small conical flask that has a capacity of 35cm3

Ø A piece of lined paper, to judge when the reaction has finished

Ø A stop-clock to determine the duration of the reaction

Ø A calculator to work out the average reaction rate

Ø A total of 280cm3 Sodium Thiosulphate

Ø A total of 80cm3 Hydrochloric acid

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