Investigatin the Rate of Reaction

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Investigating the Rate of Reaction

Aim

To investigate the effect of concentration on the rate of reaction between sodium thiosulphate and hydrochloric acid.

Prediction

I predict that as the concentration of the sodium thiosulphate is increased, the rate of reaction will increase. This is because there are more particles, therefore more chances of collisions. The graph that is going to be drawn in my analysis will have a positive correlation. Also it might be curved as the increase in rate of reaction which will not be exactly the same as the concentration of the sodium thiosulphate. This probably will be because there are more chances of collisions. So when the concentration will increase then the particles would have more energy and therefore it will move faster. This is the reason why they will collide more often.

Equipment                                Substances that we’re going to use

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Pipette                                Hydrochloric acid

Stopwatch                                Sodium thiosulphate

Spotting tile                                Water

Conical flask

Funnel

Burette

Method

1. Set up apparatus as shown in the diagram.

2. Measure 25cm3 of hydrochloric acid and pour into conical flask.

3. Add 25cm3 of 0.2 mol dm-3 of Na2S2O3 to hydrochloric acid and immediately start stopwatch.

4. When the cross disappears stop the stopwatch.

5. Record the results.

6. Repeat steps 1-5 three more times.

7. Repeat step 1-6 for 0.4, 0.6, 0.8, 1.0 mol dm -3 Na2S2O3.

Diagram

Variables-independent, dependent and control

Independent variable

This is the ...

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