Question

find the equivalent weight of salt CuSO4. 5H2O​

Answer 1

Answer:

80 g

Explanation:

Mass of CuSO4 is

= 64 + 32 + 64

= 160 g

Equivalent weight = Molar Mass / Valency

= 160/2

= 80 g

Answer 2

Equivalent weight of CuSO₄.5H₂O

Explanation:

• The equivalent weight of a salt is calculated by dividing the molar mass of that salt by n-factor.
• The n-factor represents the number of electrons that are involved while the dissociation of the salt.
• The molar mass of copper sulphate pentahydrate is:

        63.5 + 32 + (9 x 16) + (10 x 1) = 63.5 + 32 + 144 + 10 = 249.5 g/mol.

• The n-factor of the salt will be 2 as the valency of Cu is +2 and sulphate is -2.
• So, the equivalent weight will be:

        $\frac{249.5}{2} = 124.75$