Question

A solution is prepared by dissolving 5.3 g of Na2CO3 in distilled water to give 500 ml of solution.

Calculate the molarity of the solution.

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Answer 1

Answer:

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