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Investigating Rates of Reaction HCL(aq)+Na2S203(aq) = 2NaCl(aq)+SO2(g)+S(s)+H2O(l) Effects To investigate the concentration of sodium thiosulphate solution we need to look at the factors affecting rate of reaction. Temperature When the temperature is increased the rate of reaction speeds up. When the temperature decreases the rate of reaction slows down. Concentration When the concentration increases the rate of reaction increases. When the concentration decreases the rate of reaction decreases. Light Intensity When the light intensity increases the rate of reaction increases. When the light intensity decreases the rate of reaction decreases. But light intensity only affects rate or reaction in photosensitive reactions; this reaction is not so therefore light intensity is not a factor we have to consider. Catalyst This provides a different route with a lower activation energy. But in this experiment there is no known catalyst, so we don't need to consider this factor, Surface Area When the surface area increases, the rate of reaction also increases, as there are more particles. But this is...

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