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Plan
This investigation is about rates of reaction and what affects them. In this case I am going to look at hydrochloric acid and sodium thiosulphate which is a precipitation reaction. They react as in the equations below:
Sodium thiosulphate + hydrochloric acid -> sodium chloride + sulphur + sulphur dioxide + water
Na2S2O3(aq) + 2HCl(aq) -> 2NaCl(aq) + S(s) + SO2(g) + H2O(l)
Prediction:
My prediction for the experiment of mixing the 2 compounds Sodium thiosulphate and hydrochloric acid together is when the higher the concentration of sodium thiosulphate the shorter the time it will take for the reaction to be completed in are case for the cross not to be visible. Where as the lower the concentration the longer it will take for the reaction. A reaction will only occur where the particles of the reactants meet and combine. This is called the collision theory. Therefore it stands to reason that to increase the rate of reaction it is necessary to cause more particles to collide......

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Approximate Word Count: 3158
Approximate Pages: 13 (250 words per double-spaced page)

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