I have to produce a piece of work investigating rates of reaction between hydrochloric acid and sodium thiosulphate and the effect changes of concentration have on them.

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REACTION

Investigation of concentration and

Aim

I have to produce a piece of work investigating rates of reaction between hydrochloric acid and sodium thiosulphate and the effect changes of concentration have on them.

Background Information

I already know that the higher the concentration of something, the faster it will react. I know this from previous experiments and from looking in books. If the concentration of a solution is increased, there are more active particles per ml cubed. This increases the probability of active particles bumping into each other which is how the reaction is started. There are four factors which affect the rate of reaction: catalysts, temperature, concentration and surface area. I think concentration will be the most practical to do because it is easy to measure and it is not greatly effected by the room temperature. The sodium thiosulphate and the hydrochloric acid are both soluble in water. This means that either one of their concentrations can be changed, however, I have chosen to vary the concentration of sodium thiosulphate because it is found in more volume than the hydrochloric acid.

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Apparatus

For this experiment, I will need to use:

1 beaker

1 10ml measuring cylinder

1 50ml measuring cylinder

1 conical flask

1 stopwatch

a plastic lid with an X on it

1 pair of goggles

Fair Test

Things I will keep the same are:

The temperature

The amount of hydrochloric acid

The concentration of the hydrochloric acid

The person who looks at the cross (people have different ability of eye sight so we may get inaccurate results if we change the person looking at the cross.)

The position of the beaker in relation to the cross underneath ...

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