Question

Calculate the freezing point of the following solutions, assuming complete dissociation. Part A 10.4 g FeCl3 in 151 g water Part B 3.2 % KCl by mass (in water) Express your answer using two significant figures. Part C 0.175 m MgF2 Part D Calculate the boiling point of the solution in part A, assuming complete dissociation. Part E Calculate the boiling point of the solution in part B, assuming complete dissociation. Part F Calculate the boiling point of the solution in part C, assuming complete dissociation.

Answer 1

Calculate the freezing point of the following solutions, assuming complete dissociation. Part A 10.4 g FeCl3 in 151 g water

mol FeCl3 = mass/MW = 10.4/162.2 ) 0.064118

mass = 151 g of water = 0.151 kg

molal = .064118/0.151 = 0.42462

i = 1 mol of Fe+3 and 3 mol of Cl- = 4

Tf = -K*m*i = -1.86*0.42462*4 = -3.15917

Tf = -3.15917 °C

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