Which would produce the most gas when reacted with an excess mass of carbonate?

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Study for the IGCSE Edexcel Chemistry Test. Access flashcards and multiple choice questions with hints and explanations. Get ready for your exam!

Multiple Choice

Which would produce the most gas when reacted with an excess mass of carbonate?

Explanation:
Gas production comes from the reaction of carbonate with acid, and the carbonate is in excess, so the amount of gas depends on how much acid reacts. Each mole of HCl that reacts leads to 0.5 mole of CO2 (since 2 moles of HCl are needed for 1 mole of CO2). So, the option with the most moles of HCl will produce the most CO2. Calculate moles of HCl in each: - 15 cm3 of 1.0 M → 0.015 mol HCl; CO2 produced ≈ 0.0075 mol - 6 cm3 of 2.0 M → 0.012 mol HCl; CO2 produced ≈ 0.006 mol - 20 cm3 of 0.5 M → 0.010 mol HCl; CO2 produced ≈ 0.005 mol The largest amount of CO2 comes from the first option, so it would produce the most gas.

Gas production comes from the reaction of carbonate with acid, and the carbonate is in excess, so the amount of gas depends on how much acid reacts. Each mole of HCl that reacts leads to 0.5 mole of CO2 (since 2 moles of HCl are needed for 1 mole of CO2). So, the option with the most moles of HCl will produce the most CO2.

Calculate moles of HCl in each:

  • 15 cm3 of 1.0 M → 0.015 mol HCl; CO2 produced ≈ 0.0075 mol

  • 6 cm3 of 2.0 M → 0.012 mol HCl; CO2 produced ≈ 0.006 mol

  • 20 cm3 of 0.5 M → 0.010 mol HCl; CO2 produced ≈ 0.005 mol

The largest amount of CO2 comes from the first option, so it would produce the most gas.

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