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Which expression gives the equivalent conductance at infinite dilution of Al2(SO4)3, if Λ°Al3+ and Λ°SO4²− denote the equivalent conductances at infinite dilution of the corresponding ions?
- (1/3)Λ°Al3+ + (1/2)Λ°SO4²−
- 2Λ°Al3+ + 3Λ°SO4²−
- Λ°Al3+ + Λ°SO4²−
- 6(Λ°Al3+ + Λ°SO4²−)
Correct answer: Λ°Al3+ + Λ°SO4²−
Solution
The correct option is right because the equivalent conductance of Al2(SO4)3 at infinite dilution is the sum of the conductances of its ions, Al3+ and SO4²−. Since the compound dissociates into 2 Al3+ ions and 3 SO4²− ions, the total conductance is represented by the sum of their contributions, which simplifies to Λ°Al3+ + Λ°SO4²−.
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