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When Sodium Thiosulphate and dilute Hydrochloric acid react they produce a cloudy precipitate. The chemicals are both clear solutions and will react together to form a yellow precipitate of Sulphur.
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Theory When Sodium Thiosulphate and dilute Hydrochloric acid react they produce a cloudy precipitate. The chemicals are both clear solutions and will react together to form a yellow precipitate of Sulphur. The equation for this is; Na2S2O3 + 2HCl 2NaCl + SO2 + S + H2O As the solution turns cloudy we can observe the rate of reaction by placing a red cross under the beaker and seeing how long it takes for it to disappear. There are various factors that could affect this experiment, this are, time, concentration and temperature. I don't think surface area will be a factor as both chemicals are in liquid form. In my experiment I will be changing the concentration. I think that as the concentration of the Sodium Thiosulphate gets greater the time taken for the cross to disappear will become shorter. This is because in order to react with each other the two particles must be in direct...
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