Problems
1) Write the molecular and net ionic equations for any precipitation reaction that occurs for the following, if no reaction occurs, write NR:
A) Mixing together two solutions one containing sodium bromide and the other containing calcium nitrate
B) Mixing together two solutions one containing barium nitrate and the other containing lithium sulfate
2)Indicate whether each of the following is a strong or weak acid and base
a) HBr
b) Ca(OH)2
c) HI
d) HCNO
3) Write the molecular and net ionic equations for the following neutralization reactions
a) HBr + Ca(OH)2
b) solid aluminum hydroxide and nitric acid
4) Write the molecular and net ionic equation for the following gas formation reaction
CaSO3(s) + HI(aq) ->
5) Determine the oxidation numbers or oxidation states for the following elements as noted:
a) Br, KBrO3
b) Al, Al(OH)4–
Answers
1) A) NaBr(aq) + Ca(NO3)2(aq) -> NR
B) Ba(NO3)2(aq) + Li2SO4(aq) -> BaSO4(s) + 2LiNO3(aq)
Ba2+(aq) + SO42- -> BaSO4(s)
2) a) strong acid, b) strong base, c) strong acid, d) weak acid
3) a) 2HBr(aq) + Ca(OH)2(aq) -> CaBr2(aq) + 2H2O(l)
H+(aq) + OH–(aq) -> H2O(l)
b) Al(OH)3(s) + 3HNO3(aq) -> Al(NO3)3(aq) + 3H2O(l)
Al(OH)3(s) + 3H+(aq) -> Al3+(aq) + 3H2O(l)
4) CaSO3(s) + 2HI(aq) -> CaI2(aq) + H2O(l) + SO2(g)
CaSO3(s) + 2H+O(l) -> Ca2+ + H2(l) + SO2(g)
5) Remember the sum of the oxidation numbers must be equal to the charge on the compound. If its a nuetral compound, the sum of the oxidation numbers will be zero.
a) Br + 1 + -6 = 0, Br = +5
b) Al + -4 = -1, Al = +3