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10/11/2020 10:32 am
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Out of HCI and CH3COOH, which one is a weak acid and why? Describe an activity to support your answer.
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10/11/2020 10:34 am
Acetic acid (CH3COOH) is a weaker acid because it does not dissociate completely into its ions in aqueous solution.
Activity: Add zinc metal in HCl and CH3COOH respectively. The hydrogen gas will be evolved faster in HCl and slowly in CH3COOH. It shows acetic acid is a weak acid.
Alternative Method:
If we use pH paper, the colour of pH paper will be dark red in HCl and light red in CH3COOH which shows HCI is a strong acid and CH3COOH is a weak acid.