Answer to Question #232391 in General Chemistry for ahmedkamil

Question

2.56g of impure copper sulphate sample was dissolved in in water and precipitated with sodium hydroxide.if 1.234g of copper hydroxide was obtained,what is percentage of copper sulphate in the impure sample?

Answer 1

CuSO4 + NaOH + H₂O = Cu(OH)2 + Na2SO4

Mole ratio of Copper sulphate : copper hydroxide = 1:1

Molar mass of CUSO4 = 159.609

Molar mass of NaOH = 39.997

Molar mass of H₂O = 18.02

= 2.56/217.63 × 100

= 1.18%