Question

Two solutions A and B, each of 100 L was made by dissolving 4g of NaOH and 9.8 g of H₂SO₄ in water, respectively. The pH of the resultant solution obtained from mixing 40 L of solution A and 10 L of solution B is_______.

Answer 1

4gm of NaOH in 100 L sol.

⇒ 10^–3 M sol. 9.8 gm of H₂SO₄ in 100 L sol. 

⇒ 10^–3 M sol. 

Mixture : 40L of 10^–3 M NaOH and 10 L of 10^–3 M H₂SO₄ sol. Final Conc. of OH^–

Answer 2

P^H = 10 + 2 log 2 = 10.6