Buffer & pH Blitz

60-second numerical sprint on pH, pOH, Ka/Kb, salt hydrolysis & the Henderson equation.
+4 correct · −1 wrong · NEET scoring.

pH = −log[H⁺] · pH + pOH = 14
pKa + pKb = 14 (at 298 K)
Henderson: pH = pKa + log([salt]/[acid])
Ksp (AB salt): S = √Ksp
Weak acid: pH = ½(pKa − log C)
Weak base: pOH = ½(pKb − log C)
Salt hydrolysis (W weak · S strong · 2 dp):
WA + SB: pH = 7 + ½(pKa + log C)
SA + WB: pH = 7 − ½(pKb + log C)
WA + WB: pH = 7 + ½(pKa − pKb)