Hydrogen and its compoundHard
Question
The pKb of CN- is 4.7. The pH of solution prepared by mixing 2.5 mol of KCN of 2.5 mol of HCN in water and making the total volume upto 500 mL is
Options
A.10.3
B.~ 2.4
C.~2.8
D.~ 1.6
Solution
It forms basic buffer
pOH = pKb + log
= 4.7
pH = 14 - 4.7 = 9.3
pOH = pKb + log
= 4.7 pH = 14 - 4.7 = 9.3
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