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KF reacts with HF to form the compound, ...

KF reacts with HF to form the compound, KF-2HF. Discuss the probable structure of the compound.

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H-bond in HF molecule is very strong. When KF gets added to HF, one `F^(-)` ion forms H- bond with two HF molecules to form `H_(2)F_(3)^(-)` ion `[ F----H__F---H__F---]""^(-)`.
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