Q17 · CSIR-NET Chemistry, June 2019
Paper: CSIR-NET June 2019 · Subject: Physical Chemistry · Chapter: Thermodynamics · Topic: Partial Molar Quantities · Marks: 2 · Difficulty: Hard
The chemical potential ($\mu$) of a 2 molar $\mathrm{Na_2SO_4}$ solution is expressed in terms of mean ionic activity co-efficient ($\gamma_{\pm}$) as
(a)$\mu^{0} + 5RT\ln 2 + 3RT \ln\gamma_{\pm}$
(b)$\mu^{0} + 53T\ln 2 + 3RT \ln\gamma_{\pm}$
(c)$\mu^{0} + +3RT\ln\gamma_{\pm}$
(d)$\mu^{0} + +4RT\ln\gamma_{\pm}$
Answer
Answer: A ✓ checked by 4AB · confidence high
Explanation
Na₂SO₄ (2 m): m₊ = 4, m₋ = 2, m±³ = 32 = 2⁵; μ = μ° + RT ln(m±γ±)³ = μ° + 5RT ln 2 + 3RT ln γ± (a).
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