Card Set Information
Units of Concentration
What is concentration?
amount of solute present in a given amount of solution
What are hte three types of percent?
Explain % w/v
mass of components/ total volume of solution x 100
Explain % v/v
Volume of component/ total mass of solution x 100
Explain % w/w
mass of component/ total mass of solution x 100
What are parts per million
mass of component / total mass of soluiotn x 10^5
= % w/w x 10^4
What is 1 ppm equal to?
=1 g of component/ 1,000,000 grams of solutioin
= 1 mg of component/ 1 kg of solution
What is mole fraction?
Moles of A/ Total number of moles
What is molarity?
Moles of solute/ Liter of Solution
What is molality?
moles of solute/ kg of solvent
Dilution of Solutions:
Factors affecting solubility
surface area of solid solute
Most substances become more __ as temperature rises, although the exact relationship is often __ and __.
Most gases become __ in water as the temperature rises. The concentration units are __ at a gas pressure of 1 atm.
the solubility of a gas is proportional to the pressure of the gas over the solution
What are colligative properties?
What are some?
properties that depend on the number of solute particles in solution but not properties of the solvent
1) vapor pressure lowering
2) boiling point elevation
3) freezing point depression
4) osmotic pressure
Number of solute particles:
van't Hoff factor: i= moles of particles in solution/ moles of solute dissolved
Psoln=Psolv X solv
For a single solute solution, Xsolute=1-X solv
Change in vapor pressure of the solvent (the vapor pressure lowering)
DeltaP=Psolv x Xsolute
What happens if both components are volatile (have measurable vapor pressures)?
the vapor pressure has a value intermediate between hte vapor pressure of the two liquids