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Calculate the depression in the freezing...

Calculate the depression in the freezing point of water when 10 g of `CH_3CH_2CHClCOOH` is added to 250 g of water. `K_a = 1.4 x 10^(-3)`, `K_f = 1.86 K kg moL^(-1)`.

A

269.768

B

271.235

C

270.768

D

200.578

Text Solution

Verified by Experts

The correct Answer is:
C
Hint: I = 3 for `MgCl_2` solution
`DeltaT_f = I xxK_f xxW_B xx(1000)/(W_AxxM_B)`
`= 3 xx1086 xx1.9 xx(1000)/(95xx50)=2.232K`
`T_f = T_f ^@-DeltaT_f = 273 - 2.232= 270.768 K`
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