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Investigate the effect of concentration on the rate of reaction between sodium thiosulphate and hydrochloric acid. Aim The aim of my investigation is to see how the concentration of sodium thiosulphate affects the rate at which a reaction occurs between hydrochloric acid and sodium thiosulphate. Introduction To investigate the effect of concentration on the rate of reaction between sodium thiosulphate and hydrochloric acid, I will conduct an experiment. When thiosulphate reacts with hydrochloric acid, a cloudy yellow precipitate is formed. The chemical equation for this is as follows: Na2S2O3 (aq) + 2HCl (aq) 2NaCl (aq) + SO2 (g)+ S (s)+ H2O (aq) I will use the above reaction to help me measure the rate of reaction. I shall place a laminated cross on paper underneath the conical flask and I will use a stopwatch to help me measure the time it takes for the cross to become completely obstructed from view by the cloudy...

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