Question

# Use the van't Hoff factors in the table below to calculate each colligative property. Table. Van't...

Use the van't Hoff factors in the table below to calculate each colligative property.

Table. Van't Hoff Factors at 0.05 m Concentration in Aqueous Solution

 Solute i Expected i Measured Nonelectrolyte 1 1 NaCl 2 1.9 MgSO4 2 1.3 MgCl2 3 2.7 K2SO4 3 2.6 FeCl3 4 3.4

part A)

the melting point of a 0.110 m iron(III) chloride solution

part B ) the osmotic pressure of a 0.091 M potassium sulfate solution at 298 K

part c ) the boiling point of a 1.27 % by mass magnesium chloride solution

part A)

delta Tf = i x Kf x m

0 - Tf = 3.4 x 1.86 x 0.110

Tf = - 0.696 oC

melting point = - 0.696 oC

part B )

Osmatic pressure = i x M x S T

= 2.6 x 0.091 x 0.0821 x 298

Osmatic pressure   = 5.79 atm

part c ) the boiling point of a 1.27 % by mass magnesium chloride solution

moles of MgCl2 = 1.27 / 95.211 = 0.0133

molality = 0.0133 / 0.09873 = 0.1347 m

Tb = 100 + 2.7 x 0.512 x 0.1347

= 100.19 oC

boiling point = 100.19 oC

#### Earn Coins

Coins can be redeemed for fabulous gifts.