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To investigate the effect of changing the concentration of Sodium Thiosulphate on the rate of reaction between Sodium Thiosulphate and Hydrochloric acid.
Member rating: No Rating | Words: | Submitted: Wed Jan 07 2004
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PLAN: AIM: to investigate the effect of changing the concentration of Sodium Thiosulphate on the rate of reaction between Sodium Thiosulphate and Hydrochloric acid. THE REACTION: when Sodium Thiosulphate reacts with hydrochloric acid sulphur is produced. The sulphur forms in very small particles and causes the solution to cloud over and turn a yellow colour. This causes the cross to fade and eventually disappear. Sodium Thiosulphate + Hydrochloric acid "" Sulphur + Sodium Chloride + Sulphur Dioxide + Water NA2S2O3 + 2HCL "" S + 2NaCl + SO2 + H2O (aq) + (aq) "" (s) + (aq) + (g) + (l) PREDICTION: As the concentration of Sodium Thiosulphate increases the length of time for cross to disappear decreases (inverse). This is because the increase of concentration of Sodium Thiosulphate will increase the rate of reaction between Hydrochloric acid and sodium Thiosulphate particles. SCIENTIFIC REASONS FOR PREDICTION: the results from preliminary experiments (see preliminary experiments)...
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