Short answerEasy2 marks
6(b)
Copper sulphate solution reacts with sodium hydroxide solution to form a precipitate of copper hydroxide according to the equation: 2NaOH + CuSO₄ ⟶ Na₂SO₄ + Cu(OH)₂↓
What mass of copper hydroxide is precipitated by using 200 g of sodium hydroxide. [H = 1, O = 16, Na = 23, S = 32, Cu = 64]
Topic: Mole concept, gas volumes and stoichiometry
Previous-year question practice database
Answer
Exam answer
245 g Cu(OH)₂.
Explanation
2NaOH + CuSO₄ → Cu(OH)₂ + Na₂SO₄; 80 g NaOH gives 98 g Cu(OH)₂, so 200 g gives 245 g.
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