Question

Copper [II] sulphate soln. reacts with sodium hydroxide soln. to form 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]

August 6, 2024

Answer

2NaOH + CuSO₄ ⟶ Na₂SO₄ + Cu(OH)₂↓

80 g 98 g

80 g of sodium hydroxide precipitates 98 g of copper hydroxide.

∴ 200 g of sodium hydroxide will precipitate $98\over 80$ × 200

= 245 g of copper hydroxide.

Hence, 245 g. of copper hydroxide is precipitated.

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