Question

2. Calculate the new molanty of a solution formed when 20 ml of water is added to 100 ml of

0.2M NaOH​

Answer 1

New molarity = M₂ = 0.167 M

Step-by-step explanation:

Given data:

New molarity = M₂ = ?

Final volume = V₂ = 100mL + 20 mL = 120 mL

Initial volume =M₁ = 100 mL

Initial molarity =V₁ = 0.2 M

Solution:

M₁V₁ = M₂V₂

0.2 M × 100 mL = M₂ × 100 mL

M₂ = 0.2 M × 100 mL/120 mL

M₂ = 20 M.mL/120 mL

M₂ = 0.167 M