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How do changes in concentration affect the speed of a chemical reaction ?IDEAThe reaction between sodium thiosulphate and dilute hydrochloric acid is investigated.The concentration of the sodium thiosulphate is changed by adding different amounts of water.The concentration of the acid remains unchanged.EXPLANATIONIn this reaction sodium thiosulphate reacts with hydrochloric acid forming sodium chloride (salt), sulphur (a yellow solid), water and a gas sulphur dioxide.WORD EQUATION

sodium thiosulphate + hydrochloric acid sodium chloride (salt) + sulphur + water + sulphur dioxide

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

APPARATUS ...