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The limiting molar ionic conductivities of the ions X2+ and Y2− are 57 and 73, respectively. What will be the molar conductivity of the electrolyte formed by these ions?

1. 130 S cm² mol−1
2. 65 S cm² mol−1
3. 260 S cm² mol−1
4. 187 S cm² mol−1

Correct answer: 130 S cm² mol−1

Solution

The molar conductivity of an electrolyte is the sum of the limiting molar ionic conductivities of its constituent ions. In this case, adding the conductivities of X2+ (57 S cm² mol⁻¹) and Y2− (73 S cm² mol⁻¹) gives a total of 130 S cm² mol⁻¹.

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