Q11 / 220 · NTA Abhyas (NEET) 2020 · Chemistry · Ionic Equilibrium

In a buffer solution containing equal concentrations of B- and HB the Kb for B- is 10-10 . The pH of buffer solution is

  • Correct answer
    A
    4
  • B
    5
  • C
    7
  • D
    6

Solution

For acidic buffer pH can be find out as follows
pH=pKa+log10[salt][acid]
Here Kb=10-10Ka=10-4,pKa=4
As pH=4+log10[B-][HB]
As [B-]=[HB]
pH=4+log1=4

Hence, the correct answer is option: 'A'.

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