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Why `wedge_(m)^(@)` for weak electrolyte `(e.g., NH_(4)OH` or `CH_(3)COOH)` cannot be determined experimentally ?

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Why ∧ ∘ m for weak electrolyte (e.g.,NH4OH or CH3COOH) cannot be determined experimentally ? Select the correct answer from above options

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∧m of weak electrolytes keep on increasing with dilution and does not become constant at very large dilutions.

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