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 {\rm NaCl} 2 1.9 {\rm MgSO_4} 2 1.3 {\rm MgCl_2} 3 2.7 {\rm K_2SO_4} 3 2.6 {\rm FeCl_3} 4 3.4

Part A:

What is the melting point of a 6.00×10−2m iron(III) chloride solution?

Part B:

What is the osmotic pressure of a 0.077 {\rm \; {\rm M}} potassium sulfate solution at 298 {\rm K} ?

Part C:

What is the boiling point of a 1.09 {\rm \,\%} by mass magnesium chloride solution?

T = i*m*kf

FeCl3 ----> Fe+3 + 3Cl-

i = 4

T = i*m*kf

= 4*0.06*1.86

= 0.4464C0

part-B

pi = CRT

= 0.077*0.0821*298

= 1.884 atm

part-C

1.09% MgCl2 means 1.09gm of MgCl2 present in 100gm of water

molality = 1.09*1000/95.2*100

= 0.1144m

T = i*m*kb

= 3*0.1144*0.52

= 0.1784C

boiling point is 100+0.1784 =100.1784C0