Arun
Last Activity: 5 Years ago
Dear Abhishek
To solve pH of buffer solutions you use the Henderson - Hasselbalch equation for basic buffers:
Because you have a basic buffer first solve for pOH
pOH = pKb + log ([salt]/[base])
You have pKb = 4.75
You have [salt] = 0.2M
You have [base] = 0.1M
Substitute into equation:
pOH = 4.75 + log (0.2/0.1)
pOH = 4.75 + log 2
pOH = 4.75 + 0.30
pOH = 5.05
pH = 14.00-pOH
pH = 14.00-5.05
pH = 8.95
Regards
Arun (askIITians Forum expert)