Problems B
339
42. A 0.200 molal solution of Ni(NO 3 ) 2 freezes at -0.982°C. Calculate the apparent percentage of ionization of Ni(NO 3 ) 2 at this temperature.
43. If a 0.500 molal NajSC^ solution has an apparent ionization of 72.0%, at what
temperature will the solution freeze?
44. o-Chlorobenzoic acid has a composition of 53.8% C, 3.2% H, 20.4% O, and
22.6% Cl. A 0.1236 g sample of this acid dissolved in 100 g of water gives a
solution whose freezing point is -0.0147°C. A 3.265 g sample of
o-chlorobenzoic acid dissolved in 60.0 g of benzene gives a solution whose
freezing point is 4.59°C. Determine the molecular formula of o-chlorobenzoic
acid in these two solutions, and explain any difference in results.
339
42. A 0.200 molal solution of Ni(NO 3 ) 2 freezes at -0.982°C. Calculate the apparent percentage of ionization of Ni(NO 3 ) 2 at this temperature.
43. If a 0.500 molal NajSC^ solution has an apparent ionization of 72.0%, at what
temperature will the solution freeze?
44. o-Chlorobenzoic acid has a composition of 53.8% C, 3.2% H, 20.4% O, and
22.6% Cl. A 0.1236 g sample of this acid dissolved in 100 g of water gives a
solution whose freezing point is -0.0147°C. A 3.265 g sample of
o-chlorobenzoic acid dissolved in 60.0 g of benzene gives a solution whose
freezing point is 4.59°C. Determine the molecular formula of o-chlorobenzoic
acid in these two solutions, and explain any difference in results.