The aim of this experiment is to find out the effect of concentration on the reaction between Sodium Thiosulfate and Hydrochloric acid. The equation for this reaction is: 2HCl + Na S O 2NaCl + SO + S + H O

Method:

· Mix Thiosulfate and distilled water in required ratio in a glass beaker.

· Place the beaker on a mat marked with an `X'

· Add 5ml of Hydrochloric acid and start timing.

· When the cross beneath has disappeared stop timing and record results.

Safety/ Fair Test:

The solution of HCl could burn skin or damage clothing; avoid skin contact with acid. Reactions should be carried out in a well-ventilated room; some poisonous SO2(g) is produced. Goggles should be worn throughout the experiment.

To make this a fair test the volume of Sodium Thiosulfate mixed with the distilled water will always be 50ml in total. The temperature will also hopefully remain...