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An investigation into a factor affecting the rate of reaction of sodium thiosulphate (Na2S2O3) and hydrochloric acid (HCl).
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CHEMISTRY An investigation into a factor affecting the rate of reaction of sodium thiosulphate (Na2S2O3) and hydrochloric acid (HCl). Aim: I aim to investigate how altering the concentration of sodium thiosulphate will affect its rate of reaction with hydrochloric acid. The sodium thiosulphate (before dilution) is at a concentration of 40g/litre of water, and the hydrochloric acid is at 1M (1Molar). 1M designates a solution containing 1 mole of solute per litre of solvent. A mole is the molecular weight of a substance expressed in grams. I will probably use concentrations ranging from 100% to 10% in my experiment, and will repeat each concentration at least twice in order to obtain an accurate and representative average. Scientific Theory: When Na2S2O3 and 2HCl are mixed together, a yellow precipitate of sulphur is produced. This is suspended in a solution of all the other products of the reaction, making the resulting solution opaque when the reaction is complete....
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