Question

5. 200 ml of 1M H,SO4, 300 ml 3M HCl and 100 ml of 2M HCl are mixed and made up to 1 litre.
proton concentration in the resulting solution is
1) 1.25M
2 1.5M
3) 2.5M
4) 0.75M

Answer 1

Solution: M₁v₁ + M₂v₂ + M₃v₃ = Mv

→ 2(1 M × 200 mL) + 3 M × 300 mL + 2 M × 100 mL = M × 1000 L

→ 400 + 900 + 200 = 1000M

→ 1500 = 1000 M

→ 1.5 = M (OPTION 2)

Focus

♦ We did 2(1 M × 200 mL) in case of H₂SO₄ because H₂SO₄ has basicity of 2 while HCl has basicity of 1.

Hence answer is 1.5 Molarity