Question

Equal volumes of three acid solutions of pH 3, 4 and 5 are
mixed in a vessel. What will be the H⁺ ion concentration in
the mixture ?
(a) 1.11 × 10⁻⁴ M (b) 3.7 × 10⁻⁴ M
(c) 3.7 × 10⁻³ M (d) 1.11× 10⁻³ M

Answer 1

Answer:

D

Explanation:

According to volumetric pricipleV1M1 + V2M2 + V3M3 = V4M4Since the volumes are equal V1 = V2 = V3 = VM1 = 1×10−3  (since pH=3)M2 = 1×10−4  (since pH=4)M3 = 1×10−5  (since pH=5)(V + 1×10−3 ) + (V + 1×10−4 ) + (V + 1×10−5 ) = 3V + M43V + 10−3 (1+10−1 + 10−2) = 3V + M4M4 = 10−3 × (1 + 0.1+0.01)    = 1.11 ×10−3 molar