In this investigation, I will be studying the factors that affect the rate of reaction. In this case, the reaction between hydrochloric acid and sodium thiosulphate. Na2S2O3 (aq)+ 2HCl(aq) 2NaCl(aq)+S(s)+SO2(g) When hydrochloric acid is added to sodium thiosulphate, the chemicals react giving solid sulphur as one of the products. This is a precipitation reaction. By watching the speed at which the sulphur has formed, we can find …showed first 75 words of 2332 total…

…showed last 75 words of 2332 total…to collect six different sets of results, and with this I was able to create a good graph. This number I feel was enough, as the line of best fit on my graph was a straight one and showed no sign of altering. Collecting results using concentrations in between the ones I have used would have been difficult to measure, and the variations in time would have been too short, and of no real significance.