Chemical Solutions Whiteboard Review
Warm Up 4/3/17
Write the molecular/ionic/net-ionic
equations for reaction between:
KCl(aq) and Pb(NO3)2 (aq)
2 KCl + Pb(NO3)2  PbCl2 + 2 KNO3
2K1+ + 2Cl1- + Pb2+ + 2NO31-  PbCl2(s) + 2K1+ + 2NO31-
Pb
2+
(aq) +
12Cl (aq) 
PbCl2 (s)
Write the formula for determining
concentration of a solution
(molarity).
Molarity (M) =
moles solute
liter
(of solution)
Write the formula for determining
molarity (concentration) of a diluted
solution:
M1V1 = M2V2
-Identify the solute/solvent:
Cup of coffee
Solute: coffee beans(compounds such as caffeine)
Solvent: water
Paint thinner and oil-based paint
Solute: paint
Solvent: paint thinner
Ethane(C2H6) dissolved in hexane(C6H14)
Solute: ethane
Solvent: hexane
Can of Sprite
Solute: CO2 OR sugar OR flavoring
Solvent: water
Polar (P) or Non Polar (NP)?
Permanent ink
Dish soap
NP
BOTH
hydrogen chloride P
fructose
P
olive oil
NP
Octane (C8H18) NP
watercolor paint P
ethanol
P
Name 2 types of glassware useful to
make precise volume measurements
when preparing a solution.
Volumetric flask or grad. cylinder
85 g of LiCl is the maximum mass
completely dissolved in 100 g of
o
water at 20 C.
1) How would you classify this solution?
saturated
2) If additional solute is added at the
same temperature, what would you
observe?
Extra solute accumulates at bottom of
beaker
How could you transform the
previous solution into a
supersaturated solution?
Heat up the mixture until dissolved,
then allow to cool
123g of NaNO3 is the maximum
mass to completely dissolve in 100 g
o
of water at 60 C. If 80g of NaNO3
are dissolved in water at the same
temperature, how would you
classify the solution?
unsaturated
Describe the relationship between
temperature and solubility of gases.
As temp. increases the solubility of
gases descreases.
[Use solubility graphs]:
What maximum mass of nitrogen
gas is completely soluble in 100g of
o
water at 30 C?
approx. 1.7mg
2mg of NO in 100g H2O at any
temperature:
sat'd or unsat'd?
unsaturated
70g of KNO3 dissolved in 100g of
o
water at 70 C...what mass can
be added to make a saturated
solution?
Approx. 55g additional KNO3
Identify the
type of solution:
saturated
Determine molarity of an ethanol
solution made by dissolving 2.30 g of
C2H5OH in 150.mL of solution.
0.333M
How many grams of silver nitrate
are needed to prepare 250.mL of a
0.100M solution?
4.25g
*How would you prepare this solution?
Calculate the volume of a solution
that has 0.500mol of KBr and a
concentration of 0.625M.
0.800L
Calculate the dilute concentration
when 42mL of 18.0M H2SO4 are
diluted with water to a final volume
of 250.mL.
3.0M
Calculate the new molarity when
150.mL of water is added to 125mL
of 0.200M HBr.
0.091M
Solubility Rules they're really great!
They help predict precipitates...!
(s) or (aq)??
Li2CO3
AgCl
Na2SO4
(aq)
(s)
(aq)