A solution of copper sulfate 2 was added to 120 g of sodium hydroxide solution.

| May 5, 2021 | education

A solution of copper sulfate 2 was added to 120 g of sodium hydroxide solution. As a result of the reaction, a precipitate of copper hydroxide 2 and sodium sulfate were formed. Determine the mass of the precipitated copper hydroxide 2.

1. We make the equation of the reaction between sodium hydroxide and copper (II) sulfate.

2. Find the quantitative ratios involving sodium hydroxide and copper (II) hydroxide.

When 2 mol of sodium hydroxide and 1 mol of copper sulfate react, 1 mol of copper (II) hydroxide is formed, that is, they react as 2: 1.

3. Calculate the amount of sodium hydroxide substance.

n = m: M.

n = 120g: 40g = 3 mol.

If n (NaOH) = 3 mol, then n (copper hydroxide) = 1.5 mol (2 times less).

4. Find the mass of the sediment by the formula.

Answer: sediment weight = 147g.



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