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A student performed an experiment to determine the molecular formula of a given sample of hydrated copper (II) sulphate by weighing the sample before and after heating. The formula obtained experimentally was CuSO ₄ 5.5 H ₂ O while the actual formula of the given sample is CuSO ₄ 5 H ₂ O . Which experimental error would account for the wrongly obtained result?

Options

  1. ADuring heating, some of the hydrated copper(II) sulphate was lost
  2. BThe hydrated sample was not heated long enough to remove all the water present
  3. CWeight of the hydrated sample recorded was less than the actual weight taken
  4. DThe balance used in the study showed all weights consistently high by 0.10 g

Correct answer

A. During heating, some of the hydrated copper(II) sulphate was lost

Step-by-step solution

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