Name: Stoichiometry
Uploaded: 2019-07-19
Duration: 10 min 8 s
Description: Watch this video to learn the calculations of reactants or products with the help of a balanced chemical equation. It is termed stoichiometry.

Question

Copper sulfate reacts with sodium hydroxide to produce a precipitate of copper hydroxide.

${CuSO}_{4} (aq) + 2 NaOH (aq) \to Cu {(OH)}_{2} (s) + {Na}_{2} {SO}_{4} (aq)$

Calculate the mass of sodium hydroxide needed to convert $15.95 g$ of copper sulfate into copper hydroxide.

Accepted Answer

The given mass, ${CuSO}_{4} (aq) + 2 NaOH (aq) \to Cu {(OH)}_{2} (s) + {Na}_{2} {SO}_{4} (aq)$ of copper sulphate $= 15.95 g$
The molar mass of copper sulphate $({CuSO}_{4}), M_{r}$ $= [63.5 + 32 + (4 \times 16)] = 159.5 g {mol}^{- 1}$

The number of moles, $n = \frac{Given mass m}{Molar mass M_{r}} = \frac{15.95}{159.5} = 0.1 mol$

Copper sulfate reacts with sodium hydroxide to produce a precipitate of copper hydroxide according to the following balanced chemical equation:

${CuSO}_{4} (aq) + 2 NaOH (aq) \to Cu {(OH)}_{2} (s) + {Na}_{2} {SO}_{4} (aq)$

From the above equation,
$1 mol {CuSO}_{4}$ require $15.95 g$
$∴ 0.1 mol$ ${CuSO}_{4}$ require $0.2 mol NaOH$

Hence, the mass of sodium hydroxide required $= 0.2 \times$ molar mass of $NaOH$
$= 0.2 \times (23 + 16 + 1) = 8 g$

Copper sulfate reacts with sodium hydroxide to produce a precipitate of copper hydroxide.

${CuSO}_{4} (aq) + 2 NaOH (aq) \to Cu {(OH)}_{2} (s) + {Na}_{2} {SO}_{4} (aq)$

Calculate the mass of sodium hydroxide needed to convert $15.95 g$ of copper sulfate into copper hydroxide.

Important Questions on Function

Learn and Prepare for any exam you want !

Copper sulfate reacts with sodium hydroxide to produce a precipitate of copper hydroxide. CuSO4 (aq) + 2NaOH(aq) → Cu(OH)2 (s) + Na2SO4 (aq) Calculate the mass of sodium hydroxide needed to convert 15.95 g of copper sulfate into copper hydroxide.

Important Questions on Function

Learn and Prepare for any exam you want !

Copper sulfate reacts with sodium hydroxide to produce a precipitate of copper hydroxide.

${CuSO}_{4} (aq) + 2 NaOH (aq) \to Cu {(OH)}_{2} (s) + {Na}_{2} {SO}_{4} (aq)$

Calculate the mass of sodium hydroxide needed to convert $15.95 g$ of copper sulfate into copper hydroxide.