CHEMISTRY 1a, FALL, 2008
PROBLEM SET I
1) An acre-foot is an antediluvian but frequently used unit for measuring large volumes of water.
Determine the conversion factor between acre-feet and cubic meter. Note that one section of a
township is a one mile by one mile tract and contains 640 acres.
2) Write a balanced, net-ionic equation for the reaction, if any, that occurs when aqueous
solutions of the following pairs of reagents are mixed:
a) hydrobromicacid + ammonia
b) hydrobromic acid + methylamine [CH3NH2]
c) potassium hydroxide + nitric acid
d) potassium hydroxide + nitrous acid (a weak acid)
e) sodium sulfide + lead(II) nitrate
f) iron(III) chloride + sodium hydroxide
g) propionic acid [CH3CH2COOH] + sodium hydroxide
h) cesium bromide + copper(II) nitrate
i) cesium bromide + copper(I) nitrate [Cu2(NO3)2]
3) Ammonia is a non-planar polar molecule that has three N-H single bonds and one lone pair of
electrons.
a) Describe the structures of the molecular species that form when sodium
bromide dissolves in liquid ammonia.
b) Nitric acid is a very strong acid and ionizes 100% when it is dissolved in
ammonia. Write a balanced, net-ionic equation for the ionization reaction in
liquid ammonia.
c) Write a net-ionic equation for the reaction that occurs when ammonia solutions
of nitric acid and sodium amide [NaNH2] are mixed.
d) Write a net-ionic equation for the reaction that occurs when ammonia
solutions of acetic acid and sodium amide are mixed.
4) Write a balanced, net-ionic equation for the reaction that occurs when an aqueous solution of
iron(II) nitrate is mixed with each of the following aqueous solutions: a) sodium silicate, b)
sodium cyanide, c) acidified hydrogen peroxide, and d) acidified potassium permanganate.
5) Write a balanced, net-ionic equation for the reactions that occur when aqueous solutions or
slurries of the following pairs of reagents are mixed. A reaction occurs in each case. The second
reagent of each pair of reagents is present in large excess in each case.
a) manganese(II) nitrate + ammonia
b) sodium carbonate + hydrofluoric acid (a weak acid)
c) iron metal + cold, dilute nitric acid
d) iron metal + hot, concentrated nitric acid
e) manganese(II) phosphate + cold, dilute nitric acid
f) cobalt(II) hydroxide + potassium cyanide
g) sodium monohydrogen sulfite + lithium hydroxide