$$$ Quiz $$$ Solutions
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Transcript of $$$ Quiz $$$ Solutions
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$$$ Quiz $$$
Solutions
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Liquids that are soluble in each other
miscible
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Liquids that are not soluble in each other
immiscible
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When a solution contains more solute than it should.
supersaturated
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When you can’t add more solute to the solution without it precipitating out.
saturated
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Solubility is usually expressed as ….
grams of solute per 100 g of solvent
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What is the formula for Henry’s Law? What do the variables stand for?
2
2
1
1
P
S
P
S S = Solubility
P = Pressure
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Roughly speaking, what is the difference between a dilute and concentrated solution?
A dilute solution has a low amount of solute and a concentrated solution has a high amount of solute
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What is the molarity of a solution that has 15 moles of
a solute in 3 liters of solution?
5 M
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What are the units of molarity?
Mole/Liters
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How many moles of solute are in 1500 mL of a 0.333 M solution?
0.5 moles
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What is the name for a solid that is dissolved in a solution?
Solute
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What is the name for a liquid that does the dissolving in a
solution?
Solvent
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What mass of CsBr (cesium bromide) is needed to make
1.5 L of a 3.0M solution?
212.8 g/mol x 4.5 moles = 957.6 grams CsBr
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True or False. When you dilute a solution, the moles of the solution
stay the same.
True
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If 5.0 mL of 5.0M HBr is used to make a 500 mL aqueous
solution, what is the molarity of the dilute solution?
M1V1=M2V2, (5)(5)=500x = 0.05M
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A solute plus a solvent gives a _______.
Solution
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What is the formula for mass percent?
mass solute (g) x 100%mass solution (g)
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What is the formula for parts per million (ppm)?
mass solute (g) x 106
mass solution (g)
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What is the formula for volume percent?
volume solute (mL) x 100%volume solution (mL)
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If the percent mass of a solution weighing 300 g is 6%, what is the
mass of the solute?
.06 = x/300gx = 18 g
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Name the three colligative properties we studied?
- Vapor pressure lowering- Boiling point elevation- Freezing point depression
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What is the formula for freezing point depression?
Tf = Kf x m x i
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What is the formula for freezing point depression?
Tf = Kf x m x i
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What type of compounds are always electrolytes?
Ionic compounds
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What is the formula for molality?
moles solute/kg of solvent
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What is the Van’s Hoff factor of MgO?
2
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What is the Van’s Hoff factor of Na2O?
3
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What is the Van’s Hoff factor of SF3?
1, molecular (covalent) compound
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If you calculate a Tf of -12.3 oC for a pure substance that melts at 3.4oC, what is its new melting
point?
-8.9oC