Predict whether the aqueous solution of the following compounds will be acidic, basic or neutral.?

If the solution would be acidic or basic, circle the ion that causes the pH to change

Answer 1

Hydrolysis… predict acid, basic or neutral

The cations of strong bases and the anions of strong acids do not hydrolyze and therefore, do not affect the pH of the solution. Cations of weak bases react with water (hydrolyze) to form acidic solutions. Anions of weak acids hydrolyze to form basic solutions.

a. NH4Br …… acidic
NH4+ + 4HOH –> NH3 + H9O4^+ (H9O4^+ is the “new” H3O+)
b. FeCl3 ……. acidic
Fe3+ + HOH –> FeOH^2+ + H+
c. K2CO3 ….. basic
CO3^2- + HOH –> HCO3^- + OH-
d. KCIO4 …… neutral
no hydrolysis; KOH is strong base, HClO4 is strong acid
e. NaBr ……… neutral
no hydrolysis; NaOH is strong base, HBr is strong acid
f. MgCl2 …….. acidic
Mg2+ + HOH –> MgOH^+ + H+
g. NaF………… basic
F- + HOH –> HF + OH-
h. LiNO3 ……. neutral
no hydrolysis; LiOH is strong base, HNO3 is strong acid

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