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Making a salt: copper sulfate

Base + acid → salt + water, with copper(II) oxide.

Topic: Acids, bases and saltsGrade: 10Free

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What you do

  1. Add copper(II) oxide powder (2–3 portions, so it is in excess).
  2. Heat gently: the oxide dissolves in warm acid.
  3. Keep warming until the solution is clearly blue. Leftover black powder shows the oxide was in excess.

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