Weak Acids and Bases

Four equations showing the reaction of an acid in water is given below.

(I) HNO3(aq) + H2O(l) ↔ H3O+(aq) + NO3

(aq) Ka = very large

(II) H2CO3(aq) + H2O(l) ↔ H3O+(aq) + HCO3

(aq) Ka = 4.2 x 10-7
(III) NH4
+(aq) + H2O(l) ↔ H3O+(aq) + NH3(aq) Ka = 5.6 x 10-10
(IV) HCN(aq) + H2O(l) ↔ H3O+(aq) + CN-
(aq) Ka = 4.0 x 10-10
Using the equation above, determine…. (you may use the equations once, more than once, or not at all)
a. The strongest acid
b. The acid that produces the lowest concentration of hydronium ions per mole of acid
c. The diprotic acid
d. The acid with the weakest conjugate base
e. The acid with the strongest conjugate base