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Aim:
The rate of reaction can be altered by varying temperature or concentration, or by changing the surface area of a solid reactant, or by adding a catalyst and increasing the pressure.
Here I have listed the
I am going to investigate the reaction between hydrochloric acid and sodium Thiosulphate, which is a precipitation reaction, and their rate depends on temperature and the concentrations of the solutions. I will repeat this experiment at several different temperatures and concentrations. I am going to observe how the concentration and temperature will affect the rate of reaction (temperature /average time).Below is the word and symbol equation that they react in.
Sodium Thiosulphate + Hydrochloric acid -> Sodium Chloride + Sulphur + Sulphur Dioxide + Water
Na2S2O3 (aq) + 2HCl (aq) -> 2NaCl (aq) + S (s) + SO2 (g) + H2O (l)

Prediction:
For temperature I have predicted that when the temperature is increased the time and rate are likely to decrease as the reaction will happen faster. I predicted this because of the collision theory, and because I was certain that the higher the temperature would be the faster the particles will moves, therefore they will combine quicker with the other substance which is likely to make the reaction faster. The solid sulphur formed in this reaction makes the colourless solution go cloudy.
Concentration, just as increasing the temperature will increase the number of particles colliding, so will the concentration. This experiment is basically about more particles into the reaction, the probability of the colliding (crashing) is increased so the reaction is bound to take place faster. This variable is continuous and independent. As I mentioned in my aim I will be experimenting on this reaction. I predict that by doubling the concentration of the acid, the rate of reaction will double, however the time will decrease as it is happening faster.
I am going to test...