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    This is for chemistry A-Levels. I know that rate of a reaction is proportional to 1/time, but what does that mean? What is 1 in 1/time? I thought rate = change in concentration/change in time, so where did 1 come from?! Sorry if I sound a bit stupid, I'm just so confused. Any help is appreciated Thanks!
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    (Original post by theJdog)
    This is for chemistry A-Levels. I know that rate of a reaction is proportional to 1/time, but what does that mean? What is 1 in 1/time? I thought rate = change in concentration/change in time, so where did 1 come from?! Sorry if I sound a bit stupid, I'm just so confused. Any help is appreciated Thanks!
    You use one over time if you do not have a quantitative measurement of the reactant removed or product formed.

    In the case of sodium thiosulfate and hydrochloric acid a white precipitate forms. If the effect of temperature on the reaction is to be investigated then the apparatus can be set up such that the reaction mixture can be placed over a black marker 'x'. The point at which the human eye can no longer see the 'x' indicates the end point of observation for the reaction which would be CONSTANT for all temperatures. As the end is constant the rate equation can be modified such that it becomes 1/time with 1 being the constant.

    I don't know how clear that is but feel free to contact me.

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