Q. In a buffer solution containing equal concentration of B⁻ and HB, the Kb for B⁻ is 10⁻¹⁰. The pH of buffer solution is
A) 4
B) 10
C) 7
D) 6
Explanation
[Solution from source] For the buffer B⁻/HB, pOH = pK_b + log([HB]/[B⁻]). With equal concentrations pOH = pK_b = 10, so pH = 14 − 10 = 4. Answering 10 confuses pOH with pH. Answer (1).
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.