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Complete the balanced equation for this reaction - Edexcel - GCSE Chemistry - Question 3 - 2020 - Paper 1

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Complete the balanced equation for this reaction. CuCO₃ + ___________ → CO₂ + H₂O Calculate the relative formula mass of copper carbonate, CuCO₃. (relative atomic ... show full transcript

Worked Solution & Example Answer:Complete the balanced equation for this reaction - Edexcel - GCSE Chemistry - Question 3 - 2020 - Paper 1

Step 1

Complete the balanced equation for this reaction.

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Answer

The balanced equation for the reaction of copper carbonate (CuCO₃) with sulfuric acid (H₂SO₄) is:

extCuCO3+extH2extSO4ightarrowextCuSO4+extCO2+extH2extO ext{CuCO}_3 + ext{H}_2 ext{SO}_4 ightarrow ext{CuSO}_4 + ext{CO}_2 + ext{H}_2 ext{O}

Step 2

Calculate the relative formula mass of copper carbonate, CuCO₃.

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Answer

To calculate the relative formula mass of copper carbonate (CuCO₃), we use the relative atomic masses:

  • Copper (Cu) = 63.5
  • Carbon (C) = 12.0
  • Oxygen (O) = 16.0 (for 3 oxygen atoms)

Calculating the total:

extRelativeMass=63.5+12.0+(3imes16.0)=63.5+12.0+48.0=123.5 ext{Relative Mass} = 63.5 + 12.0 + (3 imes 16.0) = 63.5 + 12.0 + 48.0 = 123.5

Thus, the relative formula mass of CuCO₃ is 123.5.

Step 3

State two observations that would show the reaction has finished.

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Answer

  1. The effervescence (bubbling) stops, indicating that carbon dioxide (CO₂) production has ceased.
  2. The solution change color if the blue copper sulfate (CuSO₄) is formed, and it no longer changes after the reaction is complete.

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