Reaction with metals

2 marks · Normal

State the products formed when magnesium metal reacts with dilute propanoic acid. Write a balanced chemical equation for this reaction.

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Common mistakes: Omitting hydrogen as a product; Incorrect salt formula

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Marking points

B1 · 1 mark · States correct products: salt (magnesium propanoate) and hydrogen gas.

A1 · 1 mark · Writes balanced chemical equation: Mg(s) + 2CH3CH2COOH(aq) → (CH3CH2COO)2Mg(aq) + H2(g) or correct ionic equation.

Worked solution

When magnesium metal reacts with dilute propanoic acid, the products are magnesium propanoate (a salt) and hydrogen gas.