The freezing point of a 1.00 m aqueous solution of HF is found to be − 1.9 1 ∘ C . The freezing point constant of water, K f is 1.86 K kg mol − 1 . The percentage dissociation of HF at this concentr

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The freezing point of a 1.00 m aqueous solution of HF is found to be − 1.9 1 ∘ C . The freezing point constant of water, K f ​ is 1.86 K kg mol − 1 . The percentage dissociation of HF at this concentration is

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Δ T f ​ = K f ​ × m × i ​ i = K f ​ × m Δ T f ​ ​ = 1.86 × 1 1.91 ​ = 1.02 For HI ⇋ H + + I − ( 1 − α ) α α 1 − α + α + α = i = 1.027 1 + α = 1.027 α = 0.027 or 2.7% ​

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