Equilibrium

Equilibrium

Question

The pKa of a weak acid, HA, is 4.80. The pKb of a weak base, BOH, is 4.78. The pH of an aqueous solution of the corresponding salt, BA, will be 

  • 9.58

  • 4.79

  • 7.01

  • 9.22 

Answer

C.

7.01

It is a salt of weak acid and weak base
left square bracket straight H to the power of plus right square bracket space equals space square root of fraction numerator straight K subscript straight w space straight x space straight K subscript straight a over denominator straight K subscript straight b end fraction end root
pH space equals space 7.01

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