The Effect of Acid on Sodium Thiosulphate

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The Effect of Acid on Sodium Thiosulphate

Aim: My Aim is to see how concentration of acid will affect the time

it takes for Sodium Thiosulphate to become cloudy and make a cross

below it to disappear.

Method:

Apparatus

Hydrochloric Acid

Sodium Thiosulphate

Distilled Water

250cm ³ Beaker- I need a beaker big enough to see the cross and

although the 100cm³ would be perfect volume wise I would prefer to use

a bigger one so I can fit the cross under it and also be able to pour

the reactants into it without any spillage

100cm ³ Measuring Cylinder- I have decided to use this cylinder for

the Sodium Thiosulphate. I am only using 50cm ³ each time but I would

prefer to use one in which I only have to measure to half way as

opposed to using a 50cm ³ Measuring Cylinder and having to measure it

right to the top. It will be easier to measure

10cm ³ Measuring Cylinder- This is the smallest Measuring Cylinder

available. I will use this to measure out the Hydrochloric acid and

Distilled water because there volume together will equal 10cm³. If I

use a 50cm³ Measuring cylinder, I won't be able to get a good enough

accuracy.

Stopwatch- For timing the experiment

Pipette for measuring out accurately and piping back excess

Hydrochloric acid

Piece of paper with a black cross on it like this: To find out when

the experiment has ended. It is dark and thick because I want to

clearly see when the experiment has finished

Paper towels: For washing beakers and measuring cylinders out.

[IMAGE]

1.

2. Put the black cross underneath the 250cm ³ Beaker, leave this on

the side.

3. Measure out 50cm ³ of Sodium Thiosulphate in the 100cm ³

Measuring cylinder and pour into the 250cm ³ beaker

4. In the other 100cm ³ measuring cylinder.

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