Making soluble salts (except sodium, potassium and ammonium salts)
2 marks · EasyExplain, using balanced equations, why hydrogen gas is produced when magnesium reacts with dilute sulfuric acid to make magnesium sulfate.
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Common mistakes: Not showing both the word and symbol equations.; Omitting hydrogen gas in products.
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Marking points
M1 · 1 mark · Correct balanced equation for reaction, including hydrogen gas.
E1 · 1 mark · Explanation that hydrogen ions in the acid are reduced to form hydrogen gas.
Worked solution
Hydrogen ions from the sulfuric acid gain electrons from magnesium and are reduced to hydrogen gas, which bubbles off.