Question

find the ph of a buffer solution prepared by disolving 12.43 g a weak base B(molar mass=121.14 g/mol) plus 4.67 g of a conjugate weak acid BH (molar mass=157.6 g/mol) in 1L of water knowing that the PKa of the conjugate weak acid BH =8.07.

Answer 1

I think the weak acid should be a conjugate of strong base (B) so there is a flaw in your question

so it is a buffer of weak acid and strong base

pH= 7+ 1/2(pka +log C)