Writing and Predicting Chemical ReactionsXVII. Acidic Anhydride + Basic Anhydride →Salt- Sulfur trioxide gas is heated in the presence of sodium oxide.
SO 3 (g) + Na 2 O (s) →Na 2 SO 4 (s) - Carbon dioxide gas is heated in the presence of solid magnesium oxide.
CO 2 (g) + MgO (s) →MgCO 3 (s)
XVIII. Basic Anhydride + Acid →Salt + Water - Solid copper (II) oxide is dropped into sulfuric acid.
CuO + H+→Cu2++ H 2 O - Chunks of magnesium oxide are dropped into hydrochloric acid.
MgO + H+→Mg2++ H 2 O
XIX. Precipitation Reactions
These problems involve mixing two solutions. Each solution is a water solution of an
ionic compound. From the mixture of the two solutions, at least one insoluble precipitate
will form. The other ions present are probably soluble and are called spectator ions; they
are not included in the net ionic equation. You must know your solubility rules to do these
problems.
- A solution of silver nitrate is added to a solution of hydrochloric acid:
Ag++ Cl–→AgCl (All nitrates are soluble.) - Silver nitrate is added to a solution of potassium chromate:
Ag++CrO 4242 - "Ag CrO - Lead nitrate is added to a solution of sodium chloride:
Pb2++ Cl–→PbCl 2 - Iron(III) nitrate is added to a strong sodium hydroxide solution:
Fe3++ OH–→Fe(OH) 3 - Strontium chloride is added to a solution of sodium sulfate:
Sr^2 + SO^2 SrSO
4 " 4
XX. Redox Reactions- A strip of zinc metal is added to a solution of copper(II) nitrate:
Zn + Cu2+→Zn2++ Cu - A piece of aluminum is dropped into a solution of lead chloride:
Al + Pb2+→Pb + Al3+ - Chlorine gas is bubbled through a solution of sodium iodide:
Cl 2 + I–→I 2 + Cl–