An investigation of the rate of reaction between Sodium Thiosulphate solution and Dilute Hydrochloric acid.

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An investigation of the rate of reaction between Sodium Thiosulphate solution and Dilute Hydrochloric acid.

What I am trying to find out is that if the reaction time increases when the concentration of Thiosulphate is at different volumes.

Method

To insure that my experiment is a fair test I will not use the same measuring cylinders for the Hydrochloric acid and the Sodium Thiosulphate.  The total volume of my experiment will be 60cm³, in that there will always be 10cm³ of Hydrochloric acid this will stay the same through out the experiment and then the other 50cm³ will be a concentration of the water and Sodium Thiosulphate.

  1. Poor the Thiosulphate solution into a conical flask
  2. Put the conical flask on the paper with the black cross
  3. Then add the Dilute Hydrochloric acid and start the stop watch
  4. When you can no longer see the black cross stop the stop watch

5) Record the time on results table

I will make sure that my results will be accurate and reliable by making sure that I wash out the conical flask after each reading with cold water.  I will do this because it gets ride of all the reacted solution, if I was to wash it out with warm water, it would change the results. It would warm up the glass and the temperature of the reaction would be higher, that would make the reaction go faster.

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Equipment

1x Stop watch

1x Conical flask

1x Paper with black cross

1x 100cm³ Measuring cylinder

1x 10cm³ Measuring cylinder

1x Goggles

1x 100cm³ beaker

1x 10cm³ beaker

350cm³ of Sodium Thiosulphate

120cm³ of Hydrochloric Acid

190cm³ of Distilled Water

Safety

  1. Must wear goggles during the experiment
  2. Must tie long hair back
  3. Safety cards must be on a wall

Hazards

1) Dilute hydrochloric Acid           Irritant and corrosive if any spilt wash with water

2) Sodium Thiosulphate         Flammable and irritant ...

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