1.

The freezing point of a 1.00 m aqueous solution ofHF is found to be -1.91 ^(@)C. The freezing point constant of water, K1is 1 .86 K kg mol^(-1) The percentage dissociation ofHF at this concentration is

Answer»

`30%`
`10%`
`5.2%`
`2.7%`

Solution :`DELTA T_(t)=K_(f) xx m xx i`
`I = (Delta T_(f))/(K _(f) xxm ) = (1.91)/(1.86xx1) =1.02`
For `HI HARR H ^(+) + I ^(-)`
`1- alpha + alpha + alpha =i= 1.027`
`1+ alpha =1.02`
`alpha = 0.02 or 2.7%`


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