CHM 2045C Name:___Answers
Module 8 Sample Pretest
Module 8: Solutions Chapter 5
Part B: Factors Affecting Rate of Dissolving 5 points
State two factors greatly affecting the
solubility of a gas in a liquid:
(1) Temperature (increased temperature of a solvent also generally increases the kinetic
energy of the solute
and the gas solute acquire more of a tendency to escape from the
solvent. Therefore, Cooling the solvent increased the
solubility of a gas in a liquid solvent.)
(2) Pressure
(increasing the pressure (partial pressure) of a gas solute increases the
solubility proportionally of that solute in the liquid (Henry’s Law)
What is the main factor affecting the
solubility of a liquid in a liquid:
(3) Nature of the solute and solvent: the like dissolves like rule. The general principle that solubility is greatest when the polarity of the solute is similar to that of the solvent
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,
except gases in liquids is opposite)
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 of dissolving slows
4. Agitation or
stirring-the effect of agitation is kinetic which incresesthe
rate of solution .