Rates of Reaction - Concentration.

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Rates of Reaction - Concentration

The rate of reaction is the rate of a loss of a reactant or the formation of a product during reaction. Although there are many different variables to test, I have chosen to experiment with different concentrations of hydrochloric acid, with sodium thiosulphate as the constant.

Aim

This experiment tests how differing concentrations affect the rate of a chemical reaction. It will be done using a simple experiment where one substance is constant and the other is varying.

Apparatus

For each experiment I will need the following;

150 cm3 2 Molar hydrochloric acid

140 cm3 water

250 cm3 sodium thiosulphate

1 conical flask

1 measuring cylinder

1 stop clock

5 pieces of paper

1 pen

Preliminary Work;

Prior to this investigation, I conducted a preliminary experiment to determine the strength of my method in terms of accuracy and precision. I decided to test how the temperature of an experiment affects the rate of reaction. Therefore, I got 50 cm3 sodium thiosulphate and 40cm3 hydrochloric acid diluted with 10cm3 water. After pouring the two mixtures into a conical flask