Question

Describe how to prepare 250.0 mL of 0.50 M copper(II) sulfate pentahydrate solution from solid CuSO4.5H2O

Answer 1

molar mass of CuSO₄.5H₂O = 249.72 gm/mole that mean 1 mole of CuSO₄.5H₂O = 249.72 gm

no . of mole = molarity volume of solution in liter

no. of mole of CuSO₄.5H₂O = 0.50M 0.250 L = 0.125 mole

1 mole of CuSO₄.5H₂O = 249.72 gm then 0.125 mole of CuSO₄.5H₂O = 249.72 0.125 / 1 = 31.215 gm

to prepare 250.0 mL of 0.50 M copper(II) sulfate pentahydrate solution from solid CuSO4.5H2O require 31.215 gm

solid CuSO4.5H2O

take 31.215 gm solid CuSO4.5H2O and dilute it to 250 ml flask upto mark. you get 250.0 mL of 0.50 M copper(II) sulfate pentahydrate solution