1. When an ionic substance dissolves in water, the ions become surrounded by and separated from each other by water molecules. 2. Precipitation will occur when solutions of Na2CO3 and AgNO3 are mixed, forming the insoluble Ag2CO3. Precipitation will also occur when FeSO4 and Pb(NO3)2 are mixed, forming the insoluble PbSO4. No precipitation will occur between NaNO3 and NiSO4. 3. Strong acids and bases completely dissociate in water, while weak acids and bases only partially dissociate. A monoprotic acid contains one ionizable hydrogen per molecule

1. KEY
GENERAL CHEMISTRY-I (1411)
S.I. # 18
1. What does it mean to say that ions are hydrated when an ionic substance dissolves
in water?
2. Will precipitation occur when the following solutions are mixed? If so, write a
balanced chemical equation for the reaction.
a. Na2CO3 and AgNO3
b. NaNO3 and NiSO4
c. FeSO4 and Pb(NO3)2
3. Complete and balance the following molecular equations, and then write the net
ionic equation for each:
a. HBr (aq) + Ca(OH)2 (aq) 
b. Cu(OH)2 (s) + HClO4 (aq) 
c. Al(OH)3 (s) + HNO3 (aq) 
4. What is the difference between:
a. a monoprotic acid and a diprotic acid
b. a weak acid and a strong acid
c. an acid and a base
5. Determine the oxidation number for the indicated element in each of the following

2. KEY
substances:
a. S in SO2 _________
b. C in COCl2 _________
c. Mn in MnO4- _________
d. Br in HBrO _________
e. As in As4 _________
f. O in K2O2 _________
6. Write balanced molecular and net ionic equations for the reactions of
a. manganese with dilute sulfuric acid
b. chromium with hydrobromic acid
c. tin with hydrochloric acid
d. aluminum with formic acid HCHO2
7. Write the balanced molecular and net ionic equations for the reaction between
magnesium and colbalt(II)sulfate. What is oxidized and what is reduced in the
reaction?