Investigating the Effect of Changing the Concentration of Sodium Thiosulphate in the Reaction Between Hydrochloric Acid and Sodium Thiosulphate
Introduction
The reaction equation for this experiment is:
Sodium Thiosulphate + Hydrochloric acid =
Sodium chloride + Sulphur dioxide + Sulphur + water
Plan
Input variable: Concentration of Sodium Thiosulphate.
1) 5ml Sodium Thiosulphate 25ml water
2) 10ml Sodium Thiosulphate 20ml water
3) 15ml Sodium Thiosulphate 15ml water
4) 20ml Sodium Thiosulphate 10ml water
5) 25ml Sodium Thiosulphate 5ml water
6) 30ml Sodium Thiosulphate 0ml water
I decided on these variables by doing trial runs on the experiment.
Controlled Variables:
a) Temperature
b) Volume of Sodium Thiosulphate - water solution (always 30ml)
c) Concentration of Hydrochloric Acid (always 20ml)
d) Stirring (Y/N)
Outcome Variable
Time for Sodium Thiosulphate - Hydrochloric Acid - water solution to
go cloudy.
Experiment is considered over when a cross on a piece of paper cannot
be seen by looking through the solution from above.
Proposed Method
a) I will set up the equipment - see below
b) I will pour 20ml of Hydrochloric Acid into a measuring cylinder
c) I will pour 30ml of Sodium Thiosulphate - water solution into a
measuring cylinder.
d) I will place a beaker onto a piece of white paper with a black
cross on it.
e) I will pour the contents of both measuring cylinders in and start
the stop clock.
f) When the cross cannot be seen through the solution, I will stop the
stop clock.
g) I will then repeat the experiment, but using different
concentrations of Sodium and water in the solution to see how the
reaction rate changes.
Apparatus
=========
I will be using: 1 large beaker
1 small beaker (for Sodium Thiosulphate)
1 small beaker (for Hydrochloric Acid)
2 small measuring cylinders
1 stop clock
Prediction
==========
· I predict that the higher the concentration of Sodium Thiosulphate
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