CHEM 1211 Name:__________________

Module 8 Part A: Properties of Solutions 4 points

State 5/6 properties of true solutions:

1. It is homogeneous mixture of two or more components, solute and solvent

2. It has variable composition, that is, the ratio of solute and solvent may be varied.

3. The dissolved solute is molecular or ionic in size

4. It may be colored or colorless but it is usually transparent

5. The solute remains uniformly distributed throughout the solution and will not settle out with time (every drop has exactly the same concentration)

6. The solute generally can be separated from the solvent by purely physical means (for example evaporation or distillation)

Module 8 Part B: Rate of Dissolving Solids 4 points

State four factors which governs the rate of dissolving a solid in a liquid:

1. Particle Size (increased surface area increases rate of solution)

2. Temperature (increased temperature of solvent generally increases rate of solution)

3. Concentration of Solution- when the solute and solvent are first mixed the rate of dissolving is at a maximum, as saturation approaches the rate slows

4. Agitation or stirring-the effect of agitation is kinetic .