Answer to Question #301058 in General Chemistry for Leo

Question

Read the questions carefully. Based on what you have learned, solve the following word problems about colligative

properties.

1. Predict the boiling point of the 1.25 m sucrose solution. Sucrose is a non-volatile, nonionized solute.

2. When 15.0 g of ethyl alcohol, C2H5OH is dissolved in 750. G of formic acid, the freezing point of the solution is

7.20°C. The freezing point of pure formic acid is 8.40°C. Evaluate Kf for formic acid.

Answer 1

properties of a solution are different from those of either the pure solute(s) or solvent. Many solution properties are dependent upon the chemical identity of the solute. Compared to pure water, a solution of hydrogen chloride is more acidic, a solution of ammonia is more basic, a solution of sodium chloride is more dense, and a solution of sucrose is more viscous. There are a few solution properties, however, that depend only upon the total concentration of solute species, regardless of their identities. These colligative properties include vapor pressure lowering, boiling point elevation, freezing point depression, and osmotic pressure. This small set of properties is of central importance to many natural phenomena and technological applications, as will be described in this module.