1.
An experiment calls for you to use 200ml of 1.0M HNO
3
solution. All you have available is a bottle of 6.0M HNO
3
. How would you prepare the desired solution?
2.
Glycerol, C
3
H
8
O
3
, is a substance used extensively in the manufacturing of cosmetics, foodstuffs, antifreeze, and plastics. Glycerol is a water-soluble liquid of density 1.2656 g/ml at 15C Calculate the molarity of the solution of glycerol made by dissolving 40.00ml of glycerol at 15C in enough water to make 250.00ml of solution.
3.
Which will have the highest concentration of potassium ions: 0.20M KCl, 0.15M K
2
CrO
4
, or
0.08M K
3
PO
4
?
4.
If 30.0ml of 0.150M CaCl
2
is added to 15.0ml of 0.100M AgNO
3
, what is the mass in grams of
AgCl precipitate?
5.
A sample of 0.6760 grams of an unknown compound containing Ba 2+ , is dissolved in water and treated with and excess of Na
2
SO
4
. If the mass of BaSO
4
precipitate formed is 0.4105 grams, what is the percent by mass of Ba in the original unknown compound?
6.
The concentration of Cu 2+ ions in the water (which contains sulfate ion) discharged from a certain industrial plant is determined by adding excess sodium sulfide, Na
2
S, solution to 0.800L of water. The molecular equation is: Na
2
S + CuSO
4
Na
2
SO
4
+ CuS. Write the net ionic equation and calculate the molar concentration of Cu 2+ in the water samples if 0.0177 grams of solid CuS is formed.
7.
Which of the following could you use to prepare 300.0ml of 0.500M K
2
Cr
2
O
7
? a.
Add 30.0ml of 1.50M K
2
Cr
2
O
7
to 270.0ml of water b.
Dilute 250.0ml of 0.600M K
2
Cr
2
O
7
to a volume of 300.0ml?
8.
What volume of 0.109M HNO
3
is required to react completely with 2.50 grams of Ba(OH)
2
?
9.
When an electric current is passes through an aqueous solution of NaCl, the valuable chemicals
H
2
, Cl
2
, and NaOH are produced.
2NaCl + H
2
O H
2
+ Cl
2
+2NaOH
What mass of NaOH can be formed from 15.0L of 0.35M NaCl? What mass of chlorine is obtained?
10.What volume of 0.125M oxalic acid, H
2
C
2
H
4
, is required to react with 35.2ml of 0.546M NaOH?
H
2
C
2
O
4
+ 2NaOH Na
2
C
2
O
4
+ 2H
2
O