1
Q
PRACTICAL 4. THE EFFECT OF TEMPERATURE ON RATE. What was the aim of the experiment?
A
- To investigate how the rate (speed) of the reaction of sodium thiosulfate with hydrochloric acid changes and the temperature of the reaction is changed.
2
Q
PRACTICAL 4. THE EFFECT OF TEMPERATURE ON RATE. What was the method for the practical?
A
- Add about 10 cm of 1 mol dm-3 hydrochloric acid to the ‘acid’ tube. Place this tube into a plastic container (without the cross under it).
- Use a measuring cylinder to add 10.0 cm of 0.05 moldm-3 sodium thiosulfate solution to the second tube. Place this tube into the plastic container with the cross under it and carefully place a thermometer in this tube.
- Record the start temperature and then add 1cm of the acid to the thiosulfate solution and start timing.
- Look down through the tube from above and record the time for the cross to disappear from view.
- Record the final temperature of the reaction mixture, then pour the cloudy contents of the tube into the sodium carbonate solution.
- Now add water from a very hot water tap (or kettle) to the plastic container. The water should be no hotter than 55 °C. Add cold water if necessary.
- Measure another 10.0 cm of 0.05 mol dm sodium thiosulfate solution into a clean tube. Insert this tube into the correct hole in the plastic container (ie the one with the cross under it).
- Leave the tube to warm up for about 3 minutes.
- Repeat steps (3) to (6) in order to obtain results for at least 5 different temperatures in total.
3
Q
PRACTICAL 4. THE EFFECT OF TEMPERATURE ON RATE. what were hazards in the experiment?
A
-Sulfur dioxide is toxic and very harmful to those with asthma
- Hydrochloric acid is harmful
