The concentration of a MgSO₄ solution having the same ionic strength as that of a 0.1 M Na₂SO₄ solution is

Q100 · CSIR-NET Chemistry, December 2015

Paper: CSIR-NET December 2015 · Subject: Physical Chemistry · Chapter: Electrochemistry · Topic: Debye Huckel · Marks: 2 · Difficulty: Medium

The concentration of a $\mathrm{MgSO_4}$ solution having the same ionic strength as that of a 0.1 M $\mathrm{Na_2SO_4}$ solution is

(a)0.05 M

(b)0.067 M

(c)0.075 M

(d)0.133 M

Answer

Answer: C ✓ checked by 4AB · confidence high

Explanation

I(0.1 M Na₂SO₄) = ½(0.2×1 + 0.1×4) = 0.3; for MgSO₄ I = ½(c×4 + c×4) = 4c ⇒ c = 0.075 M.

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