Investigation to find out whether the concentration of sodium thiosulphate affects rate of reaction between itself and hydrochloric acid.

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Investigation to find out whether the concentration of sodium thiosulphate affects rate of reaction between itself and hydrochloric acid

Aim Plan

To see how changing the concentration of sodium thiosulphate affects the rate of reaction between sodium thiosulphate and hydrochloric acid.

Method

For my first experiment I will mix 20cm^3 of sodium thiosulphate with 10cm^3 of dilute hydrochloric acid then time until the mixture turns opaque or becomes a ‘precipitate’ and I can’t see the picture underneath.

I will repeat the experiment changing only the concentration of sodium thiosulphate but keep everything else the same.

To make the experiment fair I will make sure I only change the concentration of sodium thiosulphate and not anything else. I will keep the hydrochloric acid, the picture and the beaker the same.

I will do a second experiment where instead of changing the sodium thiosulphate I will change the concentration of hydrochloric acid.

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The calculations to find out the new molarity are:

Original molarity x volume of thio  = 0.2 x 16

               Total volume                            20

Prediction

I think that when I decrease the concentration of sodium thiosulphate, the rate of reaction will decrease and the time it takes to precipitate will increase. This is because when the concentration is decreased there are fewer molecules to collide with the hydrochloric acid molecules so the reaction will be slower.

Results

Experiment 1

Experiment ...

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