Name:
Period:
Subject:
AP Chem
Date:
Exam - Aqueous Solutions
Please make sure that you show all work! (italics, bold and underlined – get it?) Some problems
include points for intermediate steps as well as the final answer. If the intermediate step isn’t
shown, the points aren’t given! Be sure to write your name and period above.
1. Show the balanced reaction, ionic reaction, and net ionic reaction for a mixture of aqueous
calcium chlorate and aqueous potassium sulfate (include indications of state - ex: (aq) )?
Ca(ClO3)2(aq) + K2SO4(aq) => CaSO4(s) + 2KClO3(aq)
Ca2+(aq) + 2ClO3-(aq) + 2K+(aq) + SO42-(aq) => CaSO4(s) + 2K+(aq) + 2ClO3-(aq)
Ca2+(aq) + SO42-(aq) => CaSO4(s)
If 300.0 ml of 1.50 M calcium chlorate mixes with 200.0 ml of 2.00 M potassium sulfate, how
many grams of precipitate will form?
0.3000 L  1.50 mol/L = 0.45 mol Ca(ClO3)2
0.2000 L  2.00 mol/L = 0.4 mol K2SO4
0.4 mol K2SO4 
= 0.2 mol Ca(ClO3)2
so K2SO4 is limiting and Ca(ClO3)2 is in excess.
0.4 mol K2SO4 
= 0.2 mol CaSO4
0.2 mol CaSO4 
= 27.228 g CaSO4 = 27.2 g CaSO4
What ions are left in solution and at what concentrations?
2. An aqueous solution of sodium bicarbonate (baking soda) is mixed with hydrochloric acid to
produce carbon dioxide bubbles, water, and sodium chloride. Write the molecular, ionic, and
net ionic equations for this reaction.
What volume of 1.5 M baking soda solution would be required to neutralize 350.0 mL of a 0.30
M solution of hydrochloric acid?
3. 40.0 mL of 0.500 M HCl and 35.0 mL of 0.400 M NaOH are mixed together. Calculate the
moles of water produced and the concentration of excess H+ or OH - remaining after the reaction
is complete.
4. 250. mg of ammonium carbonate is added to 40.0 mL of 0.100 M calcium chlorate and forms
a precipitate. Write the molecular equation (balanced reaction) for this reaction.
What is the limiting reactant?
What is the theoretical yield (in grams) of the precipitate that forms?
5. Write balanced net ionic reactions for each of the following aqueous mixtures and list who the
spectator ions are for each reaction:
a) zinc acetate and ammonium hydroxide
b) lithium hydroxide and calcium chlorate
c) zinc nitrate and potassium phosphate