Saturday, April 13, 2013

GCSE Science Coursework - Investigating the factors that affect the reaction between sodiumthiosulphate and hydrochloric acid

Investigating the factors that affect the reply between sodiumthiosulphate and hydrochloric acid


To investigate the differences in site of reaction between sodiumthiosulphate and hydrochloric acid as the concentration of sodiumthiosulphate is every raised or lowered while keeping the extreme intensiveness of the sodiumthiosulphate solution at 50cm .

The chemical reaction for this experimentation is:


I start with 5cm of hydrochloric acid to which I make up a varying concentration of sodiumthiosulphate. To change the STS (sodiumthiosulphate) concentration I impart add 10cm of water to a fresh flask of STS afterwards each(prenominal) experiment while each time reducing the volume of STS by the same amount. I will be metre the results by timing the reaction until the solution is too cloudy and modify with sodium for an image underneath the flask to be seen. I am allowing up to leash minuets for this reaction to take place, after which time the concentration will simply be label as over three mins.

Using this method my final results instrument panel will read as follows:

Volume of Sodiumthiosulphate         Volume of Water          concentration of Solution (Molar)         Results - Time Taken

50cm         0cm         0.2m         

40cm         10cm         0.16m         

30cm         20cm         0.12m         

20cm         30cm         0.08m         

10cm         40cm         0. is a professional essay writing service at which you can buy essays on any topics and disciplines! All custom essays are written by professional writers!


Using a table as seen preceding(prenominal) allows me to make a graph displaying the correlation between the contrary values used in the experiment once I have filled in my results column.


To conduct this experiment I will need:

Approximately 150cm of STS

Approximately 25cm of acid and

Approximately 100cm of water

These volumes of STS, water and acid will be enough for me to run one batch of experiments, these amounts top executive need to be increased by up to three times to accurately carry out the experiment. As hygienic as the liquids I will also need:

Conical Flasks

Measuring Cylinder


Safety Goggles

I expect that as the solution of STS becomes less concentrated the rate of reaction will slowdown and may exceed the time specialize for the experiment.

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