Jawabanmu

2014-06-11T19:04:16+07:00
A. HA ⇒ H^+ + A^-
H+ =10^-9
pH = 9

b. OH- = 2 x 10^-12
pOH = 12-log2
pH = 2+log2

c.H+ = 25 x 10^-5 = 2,5 x 10^-4
pH = 5 - log 25
atau bisa juga
pH = 4 - log 2,5