Calculate the pH of a 0.51 M solution of KOH.
A)14.00
B)13.71
C)0.29
D)0.51
E)none of these

Question

Quizplus · Accepted Answer

KOH is a strong base dissociates completely in water to give OH- ions. 
KOH → K+ + OH-
Concentration of OH- ions in 0.51 M solution of KOH = 0.51 M 
To calculate pH, we need to first calculate pOH using the relation: 
pOH = -log[OH-] 
pOH = -log(0.51) = 0.29 
Now, using the relation: 
pH + pOH = 14 
pH = 14 - pOH = 14 - 0.29 = 13.71 
Therefore, the pH of a 0.51 M solution of KOH is 13.71.

Calculate the PH of a 0