Question

Q) What is the concentration in moles per litre of:
a) a sodium carbonate solution containing 53 g of the
salt (Na2CO3) in 1 litre?
b) a copper(ll) sulfate solution containing 62.5 g of
the salt (CuSO4.5H20) in 1 litre?

Answer 1

Explanation:

Molecular mass of Na

2

CO

3

=106 gmol

−1

∴ Number of moles =

106

53

=0.05mol

As 0.05 mol are dissolved in 500mL;

Number of moles dissolved in 1000mL (1L) or molarity of th solution

=

500

0.05

×1000=0.1M