THIOSULFATE AND HCL:
- 2 chemicals are both clear solutions
- react together to form a yellow precipitate of sulphur
- higher temperature quicker reaction
- black mark to disappear through the cloudy sulphur and timing how long it takes
HYDROCHLORIC ACID AND MARBLE CHIPS
- gas syringe and take readings at regular intervals
- repeat the experiment with exactly the same volume of acid, and exactly the same mass of marble chips but more crushed up
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