Na25203 Investigation

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PLANNING:

We have to produce a coursework, which investigates the rates of reaction, and the effects of different changes have on them.  There is five factors which affects the rate of reaction, according to the collusion theory of reacting particles: temperature, concentration (of solution), pressure (in gases), surface are (of solid reactants), and catalysts.  In this experiment we have to see how quickly the sodium thiosulphate and water turn milky and the effects that happen.  I can tell when it goes totally cloudy when the cross is no longer visible.

The reaction that will be used is:

Na25203 (aq) + 2HCL (aq) →         2NACL (aq) + H2O (l) + SO2 (g)         + S (s)

Sodium        + Hydrochloric →          Sodium          + Water    + Sulphur    + Sulphur          

Thiosulphate           acid                              chloride                              dioxide

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Both the sodium thiosulphate and the hydrochloric acid are soluble in water, so the concentration of either can be changed.

This is the method:

The first step is to stand up the conical flask on the cross, which is on the piece of paper.

Using a measuring cylinder pour in 50 cm of Sodium Thiosulphate solution.  Carefully pour it in to the conical flask.

Measure 5cm ...

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