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Sodium Thiosulphate & Acid Planning To ensure that this experiment is safe, I have taken some precautions. I wore goggles at all times, made sure not to spill any chemicals such as the acid onto skin or clothes, and to be aware of glass. I have used various different apparatus, including two measuring cylinders, one 25ml, and the other 50ml. I used a 150ml chronicle flask and a stopwatch. Here is a few diagrams of these apparatus. What I Will Vary, Not Change To Keep A Fair Test & What I Will Observe & Measure I will vary the amount of Sodium Thiosulphate (10-50ml), but keeping the same amount of Hydrochloric Acid (25ml) to make it a fair test. Also when I vary the amount of Sodium Thiosulphate, I will always keep the same total volume of the mixture, therefore topping it up to 75ml every time. I will be observing the reaction of...

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