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$$$ Quiz $$$ Solutions. Liquids that are soluble in each other. miscible. $1. Liquids that are not soluble in each other. immiscible. $1. When a solution contains more solute than it should. supersaturated. $1. When you can’t add more solute to the solution without it precipitating out. - PowerPoint PPT Presentation
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$$$ Quiz $$$
Solutions
Liquids that are soluble in each other
miscible
Liquids that are not soluble in each other
immiscible
When a solution contains more solute than it should.
supersaturated
When you can’t add more solute to the solution without it precipitating out.
saturated
Solubility is usually expressed as ….
grams of solute per 100 g of solvent
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
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
What is the molarity of a solution that has 15 moles of
a solute in 3 liters of solution?
5 M
What are the units of molarity?
Mole/Liters
How many moles of solute are in 1500 mL of a 0.333 M solution?
0.5 moles
What is the name for a solid that is dissolved in a solution?
Solute
What is the name for a liquid that does the dissolving in a
solution?
Solvent
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
True or False. When you dilute a solution, the moles of the solution
stay the same.
True
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
A solute plus a solvent gives a _______.
Solution
What is the formula for mass percent?
mass solute (g) x 100%mass solution (g)
What is the formula for parts per million (ppm)?
mass solute (g) x 106
mass solution (g)
What is the formula for volume percent?
volume solute (mL) x 100%volume solution (mL)
If the percent mass of a solution weighing 300 g is 6%, what is the
mass of the solute?
.06 = x/300gx = 18 g
Name the three colligative properties we studied?
- Vapor pressure lowering- Boiling point elevation- Freezing point depression
What is the formula for freezing point depression?
Tf = Kf x m x i
What is the formula for freezing point depression?
Tf = Kf x m x i
What type of compounds are always electrolytes?
Ionic compounds
What is the formula for molality?
moles solute/kg of solvent
What is the Van’s Hoff factor of MgO?
2
What is the Van’s Hoff factor of Na2O?
3
What is the Van’s Hoff factor of SF3?
1, molecular (covalent) compound
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