Question

Calculate the amount of ice that will separate out on cooling containing `50 g `of ethylene glycol in `200 g` of water to `-9.3^(@)C (K_(f)` for water =`1.86 K mol^(-1) kg`)
A. 38.71 g
B. 38.71 mg
C. 42 g
D. 42 mg

Answer 1

Correct Answer - A
`HA hArr H^(+) + A^(-)`
`{:(t = 0," "C,0,0),(t_("eq"),C - C alpha,C alpha,C alpha):}`
`[H^(+)] = C alpha, [H^(+)] = 10^(-PH)`
`:. C alpha = 10^(-2)`
`0.1 alpha = 10^(-2)`
`alpha = 0.1`
`alpha = (I - 1)/(n - 1) , 0.1 = (I - 1)/(2 - 1)`
`i = 1.1`
`:. pi = iCRT`
`= 1.1 xx 0.1 xx RT = 0.11 RT`