Question

Find the molarity of Na₂SO₄ formed upon mixing of 0.2 M, 2 L H₂SO₄ and 0.1 M, 2 L Na OH.

(a) 0.05 M

(b) 0.03 M

(c) 0.04 M

(d) 0.025 M

Answer 1

Correct option is (d) 0.025 M

∴ 2 moles of NaOH → 1 mole of Na₂SO₄

∴ 0.2 moles of NaOH → 0.2/2 =  0.1 moles of Na₂SO₄

M_{\(ka_2so_ 4\)} = 0.1/4 = 0.025 M