The mean ionic activity coefficient of 0.004 molal CaCl₂ in water at 298 K (rounded off to three decimal… · ABC26PH0706

Subject: Physical Chemistry · Chapter: Electrochemistry · Topic: Debye Huckel · Exam: JAM 2001-2022 · Marks: 2 · Difficulty: Hard

The mean ionic activity coefficient of 0.004 molal $\mathrm{CaCl_2}$ in water at 298 K (rounded off to three decimal places) is ____. (Given: Debye-Huckel constant for an aqueous solution at 298 K is $0.509\,\mathrm{kg^{1/2}\,mol^{-1/2}}$)
Answer
SELF-PRACTICE — the source book printed no answer.

Nothing is invented here, so this question has no answer on record.

Explanation
Answer: γ± ≈ 0.774 — I = 3m = 0.012; log γ± = −0.509 × 2 × √0.012 = −0.1115; γ± = 0.774.

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