The molar conductivities at infinite dilution for , and are , and respectively at . Find the molar…
The molar conductivities at infinite dilution for $\text{NaI}$, $\text{CH}_3\text{COONa}$ and $(\text{CH}_3\text{COO})_2\text{Mg}$ are $126\cdot9$, $91\cdot0$ and $187\cdot8\text{ ohm}^{-1}\text{ cm}^2\text{ mol}^{-1}$ respectively at $25^\circ\text{C}$.
Find the molar conductivity at infinite dilution for $\text{MgI}_2$ at $25^\circ\text{C}$.
Answer
Answer
AIWritten by AI (gemini) - it can contain mistakes.
According to Kohlrausch's law of independent migration of ions:
$\Lambda_m^\circ(\text{MgI}_2) = \Lambda_m^\circ[(\text{CH}_3\text{COO})_2\text{Mg}] + 2\Lambda_m^\circ(\text{NaI}) - 2\Lambda_m^\circ(\text{CH}_3\text{COONa})$
$= 187\cdot8 + 2(126\cdot9) - 2(91\cdot0) = 187\cdot8 + 253\cdot8 - 182\cdot0 = 259\cdot6\text{ ohm}^{-1}\text{ cm}^2\text{ mol}^{-1}$
Final answer: 259.6 ohm-1 cm2 mol-1
Final answer: 259.6 ohm-1 cm2 mol-1
From ISC 2027 Specimen Chemistry Paper 1, question 17(ii).