Question

150 cm³ of a decimolar NaOH solution are diluted to 750 cm³. Find the molarity of the diluted solution.

Answer 1

Given: Initial volume V₁ = 150 cm³ = 0.150 L

Initial molarity M₁ = 0.1 mol/L (decimolar)

Final volume V₂ = 750 cm³ = 0.750 L

Final molarity M₂ = ?

M_1​V₁​ = M₂V₂

​⇒ 0.1 × 0.150 = M₂ ​× 0.750

`M_2 = 0.015/0.750`

= 0.02 mol/L

∴ Molarity of the diluted solution is 0.02 mol/L.