Find out if the rate of reaction varies with different amounts of concentration.

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Investigating the rate of reaction between Sodium Thiosulphate and Hydrochloric Acid

Aim:

Our aim is to find out the rate of reaction varies with different amounts of concentration.

Hypothesis:

As the concentration increases the rate of reaction will change.

Scientific Knowledge:

The reactants (Na S O and HCl) should collide for the reaction to happen. A higher concentration of Sodium Thiosulphate means more particles are present, this means more collisions will occur. Less concentration of Sodium Thiosulphate means fewer collisions will occur.

There are factors, which could change the rate of reaction, these are:

TEMPERATURE

CONCENTRATION: This is the 1 factor that will be changed.

SURFACE AREA

PRESSURE

CATALYST

In the reaction I am investigating no catalysts and solid reactants are used, therefore surface area is not important in this experiment. No gaseous reactants so pressure is not involved. There are two reactants. I am keeping the Hydrochloric Acid constant and only changing the concentration of Sodium Thiosulphate.

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Prediction:

I predict that as the concentration of Sodium Thiosulphate decreases, the rate of reaction will slow down as well.

         Na  S  O  +  HCl               NaCl + S + SO  +  H  O

Sodium Thiosulphate + Hydrochloric Acid          Sodium Chloride + Sulphur Dioxide +Water                

Apparatus/Chemicals

Conical Flask                        Sodium Thiosulphate

White paper with a cross      Hydrochloric Acid

2 measuring ...

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