The word equation for the reaction between copper carbonate and dilute sulfuric acid is copper carbonate + sulfuric acid → copper + carbon dioxide + water (i) Complete the balanced equation for this reaction - Edexcel - GCSE Chemistry Combined Science - Question 3 - 2020 - Paper 1

To find the relative formula mass of copper carbonate (CuCO₃), we sum the atomic masses of its constituent elements:

• Copper (Cu): 63.5
• Carbon (C): 12.0
• Oxygen (O): 16.0 (there are 3 oxygen atoms)

Thus, the calculation is:

$\text{Relative formula mass} = 63.5 + 12.0 + (3 \times 16.0)$ $= 63.5 + 12.0 + 48.0$ $= 123.5$

Therefore, the relative formula mass of CuCO₃ is 123.5.

The correct answer is:

A. bubble the gas through limewater, limewater turns cloudy.

This is a well-known test for carbon dioxide, as it forms calcium carbonate, which is insoluble and causes the limewater to turn cloudy.