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The measured freezing point depression f...

The measured freezing point depression for a 0.1m aqueous `CH_3COOH` solution is `0.19^oC`. The acid dissociation constant `K_a` at this concentration will be ? (Given `K_f` the molal cryoscopic constant =`1.86K kgmol^(−1)`

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`-122^@C`
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