03 measure sometings

Question 1

step-s in full

Answer 1

3 – Investigating how rate changes with temperature
e.g.
• Use a measuring cylinder to measure 10.0 cm3 of 0.05 mol dm-3
sodium thiosulfate solution into a conical
flask. Place this on a white tile with cross drawn.
• Record the initial temperature
• Add 1 cm3 of 1 mol dm-3 hydrochloric acid to the sodium thiosulfate solution and start timing.
• Record the time for the cross to disappear from view.
• Record the final temperature of the reaction mixture.
• Repeat (using water baths/ice) to obtain results for at least 5 different temperatures in total.
• Plot a graph of temperature v time, using the average temperature for each reaction.
Notes
• If the reaction is exothermic, you can only approximate the temperature of the reaction by taking a reading
of the initial temperat

Question 2

3 – Investigating how rate changes with temperature

e.g. steps 1 and 2

Answer 2

• Use a measuring cylinder to measure 10.0 cm3 of 0.05 mol dm-3
sodium thiosulfate solution into a conical
flask. Place this on a white tile with cross drawn.
• Record the initial temperature

Question 3

steps 3 And 4

Answer 3

• Add 1 cm3 of 1 mol dm-3 hydrochloric acid to the sodium thiosulfate solution and start timing.
• Record the time for the cross to disappear from view.

Question 4

steps 5 and 6

Answer 4

• Record the final temperature of the reaction mixture.

* Repeat (using water baths/ice) to obtain results for at least 5 different temperatures in total.

Question 5

steps 7 and 8

Answer 5

• Plot a graph of temperature v time, using the average temperature for each reaction.

Question 6

Notes

Answer 6

• If the reaction is exothermic, you can only approximate the temperature of the reaction by taking a reading
of the initial temperat