Ionic EquilibriumHard
Question
In which of the following cases, pH is greater than 7 ?
Options
A.50 ml of 0.1 MHCl + 50 ml of 0.1 MNaCl
B.50 ml of 0.1 M H2SO4 + 50 ml of 0.2 M NaOH
C.50ml of 0.1 M CH3COOH + 50 ml of 0.1 M KOH
D.50 ml of 0.1 M HNO3 + 50 ml of 0.1 M NH3
Solution
(a) [H3O+] = 
0.05;
pH = - log 0.05 = 1.301
(b) Complete neturalization of strong acid and strong base, pH = 7.
(c) Hydrolysis of the salt CH3COOK, pH > 7 (salt of weak acid with strong base)
(d) Hydrolysis of the salt NH4NO3 pH < 7 (salt of strong acid with weak base)
0.05;pH = - log 0.05 = 1.301
(b) Complete neturalization of strong acid and strong base, pH = 7.
(c) Hydrolysis of the salt CH3COOK, pH > 7 (salt of weak acid with strong base)
(d) Hydrolysis of the salt NH4NO3 pH < 7 (salt of strong acid with weak base)
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