How the rate of reaction changes in a reaction between Hydrochloric Acid and Sodium Thiosulphate

Essay by jamfrostA, July 2004

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Chemistry coursework:

An investigation of the affect of the concentration an of the rate of reaction.


We are trying to find out the affect of acid concentration on the rate of reaction, we are using 2, 1.5, 1, 0.5, 0.25 Molar acid. In our experiment, we are reacting it with sodium thiosulphate. The collision theory will be involved in this, for instance the more concentrated the acid we use, the faster the reaction will occur and the lower the concentration the slower the reaction will occur, this is because the collision theory says that if something is more concentrated then it will collide more because there will be more of the substance. We could use a catalyst to speed up the reaction, this allows the molecules to move around easier to help them to collide more to speed up the reaction for instance say that people are trying to get over wall it is possible but it will take a slow process and say that we add a catalyst, our catalyst is a ladder this enables the people (molecules) to get over the wall quicker and easier than they normally would.

In this experiment we need to control the amount of acid, amount of water, chemicals\water temperature amount of sodium thiosulphate and to all agree when the x is gone on the paper. We need to be safe when doing this by wearing goggles and making sure that we dispose of the end result chemical in a large beaker in the fume cupboard and not down the sink, we also need to make sure we do not lean over the conical flask when we perform the experiment because the chemical fumes are pungent and are not good to breath in.


We are going to measure the rate of...