Flashcards in Chapter 16 Key Concepts Deck (10):
What determines whether a substance will dissolve? What determines how fast a substance will dissolve?
The compositions of the solvent and the solute; stirring (agitation), temperature, and surface area
What units are usually used to express the solubility of a solute?
Grams of solute per 100g of solvent
What are two conditions that determine the mass of solute that will dissolve in a given mass of solvent?
Temperature and pressure
How do you calculate the molarity of a solution?
Divide the moles of solute by the volume of the solution (in liters)
Compare the number of moles of solute before dilution with the number of moles of solute after dilution.
Diluting a solution reduces the number of moles of the solute per unit volume, but the total number of moles of solute in solution does not change.
Moles of solute= M1xV1=M2xV2
What are two ways of expressing the concentration of a solution as a percent?
The ratio of the volume of the solute to the volume of the solution or the ratio of the mass of the solute to the mass of the solution
What are the three colligative properties of solutions?
Vapor-pressure lowering, boiling-point elevation, and freezing-point depression
What factor determines how much the vapor pressure, freezing point, and boiling point of a solution differ from those properties of the pure solvent?
The number of solute particles dissolved in the solvent
What are two ways of expressing the ratio of solute particles to solvent particles?
Unit molality and mole fractions