Answer: 13.79
Explanation: c(NaOH) = 0.62 mol/l, andc(OH-) = 0.62 mol/l.
Because pH +pOH = 14.00 and pOH = -log(OH) = -log(0.62) = 0.2076
Then PH= 14.00-0.2076 = 13.79
