9. Solutions

The diagram to the right shows plots of vapor pressure versus temperature for a solvent and a solution. What is the approximate boiling-point elevation for the solution?

When 1 mol of HCl is added to 1 kg of water, the boiling point increases by 1.0 °C, but when 1 mol of acetic acid, CH₃CO₂H is added to 1 kg of water, the boiling point increases by only 0.5 °C. Explain.

HF is a weak electrolyte and HBr is a strong electrolyte. Which of the curves in the figure represents the change in the boiling point of an aqueous solution when 1 mole of HF is added to 1 kg of water, and which represents the change when 1 mol of HBr is added?

Which of the following solutions will give rise to a greater osmotic pressure at equilibrium: 5.00 g of NaCl in 350.0 mL water or 35.0 g of glucose in 400.0 mL water? For NaCl, MW = 58.5 amu; for glucose, MW = 180 amu.

To prevent accumulation of ice on roads and sidewalks, many municipalities (and home-owners) will apply de-icing compounds to 'melt' the ice by lowering the freezing point. Some de-icing compositions include dyes or colored compounds called indicators. Why?