Ionic EquilibriumHard
Question
When 0.1 mole solid NaOH is added in 1lt of 0.1 M NH3(aq) then which statement is wrong?
(Kb = 2 × 10-5, log 2 = 0.3)
(Kb = 2 × 10-5, log 2 = 0.3)
Options
A.degree of dissociation of NH3 approaches to zero.
B.change in pH by adding NaOH would be 1.85
C.In solution, [Na+] = 0.1 M, [NH3] = 0.1 M, [OH-] = 0.2 M.
D.on addition of OH-, Kb of NH3 does not changes.
Solution
Initial pH = 
(pKb - log C) = 
(5 - log 2 - log 0.1) = 2.85
After adding NaOH, pOH of solution = 1
Change in pOH = 1.85
(pKb - log C) = (5 - log 2 - log 0.1) = 2.85After adding NaOH, pOH of solution = 1
Change in pOH = 1.85
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