29. Which has the lowest freezing point? a. 0.050 M KNO3 b. 0.020 M Na3PO4 c....

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Answer 1

Answer #1

29) answer : c) has lowest freezing point

delta Tf = i x Kf x m

a)

i = number of ions , for KNO3 , i = 2

Tf = - 2 x 1.86 x 0.05 = - 0.186 oC

b)

Na3PO4 , i = 4

Tf = - 4 x 1.86 x 0.02 = - 0.149 oC

c)

i = 3

Tf = - 0.418 oC

d) for pure water = 0 oC

so

CaCl2 has lowest freezing point.

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Answer 2

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