An investigation into the factors affecting the rate of a reaction: The write up of an experiment using Sodium Thiosulphate and hydrochloric acid

Skill Area P: Planning What I going to investigate is how different factors affect the rate of the chemical reaction of Sodium Thiosulphate and Hydrochloric acid. In which a precipitate is formed and causes the solution to become opaque. They react as in the equation below: Sodium Thiosulphate + hydrochloric acid -->; sodium chloride + sulphur + sulphur dioxide+ Water Na2S2O3(aq) + 2HCl(aq) -> 2NaCl(aq) + S(s) + SO2(g) + H2…

…the temperature needed. I will then pour and mix the mix them together in the beaker attached to the clamp: once this has been done my partner will place a marker on 'Log-it Lab' to show when I had put both the solutions into the beaker, so that we can work out the length of time it takes for the light level to drop 40% as before. The experiment will be repeated three times as before.