Ch 11.2

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1. What is concentration?
amount of solute present in a given amount of solution
2. What are hte three types of percent?
• %...
• - w/v
• - v/v
• - w/w
3. Explain % w/v
mass of components/ total volume of solution x 100
4. Explain % v/v
Volume of component/ total mass of solution x 100
5. Explain % w/w
mass of component/ total mass of solution x 100
6. What are parts per million
• mass of component / total mass of soluiotn x 10^5
• = % w/w x 10^4
7. What is 1 ppm equal to?
• =1 g of component/ 1,000,000 grams of solutioin
• = 1 mg of component/ 1 kg of solution
8. What is mole fraction?
Moles of A/ Total number of moles
9. What is molarity?
Moles of solute/ Liter of Solution
10. What is molality?
moles of solute/ kg of solvent
11. Dilution of Solutions:
V1C1=V2C2
12. Factors affecting solubility
• temp
• presure
• surface area of solid solute
• stirring
• polarity
13. Most substances become more __ as temperature rises, although the exact relationship is often __ and __.
• soluble
• complex
• nonlinear
14. Most gases become __ in water as the temperature rises. The concentration units are __ at a gas pressure of 1 atm.
• less soluble
• millimoles
15. Henry's Law
• the solubility of a gas is proportional to the pressure of the gas over the solution
• Sg=kPg
16. 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
17. Number of solute particles:
van't Hoff factor: i= moles of particles in solution/ moles of solute dissolved
18. non-ionic solutes
1=1
19. ionic solutes
i>1
20. Raoult's Law
• Psoln=Psolv X solv
• For a single solute solution, Xsolute=1-X solv
21. Change in vapor pressure of the solvent (the vapor pressure lowering)
DeltaP=Psolv x Xsolute
22. 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
 Author: DesLee26 ID: 199570 Card Set: Ch 11.2 Updated: 2013-02-22 03:51:06 Tags: CHM 112 Folders: Description: Units of Concentration Show Answers: