Question

Sebanyak 25 mL larutan CH3COOH 0,2 M (Ka CH3COOH=10*-5) dicampur dengan 25 mL larutan NaOH 0,2 M.pH larutan yang terjadi adalah

Answer 1

Karena asamnya bereaksi sempurna mk pake rumus hidrolisis
[OH]=akar(Kw*[garam]/ka)
=akar(10^-14 * 0,1/10^-5)
=akar(10^-10)
=10^-5
pOH=-log10^-5
=5
pH=14-5
=9
*[garam]=mol/volum total
=5/50
=0,1

Answer 2

M=5/50=10^-1
[OH-] = akar Kw/KaxM
= akar 10^-14/10^-5x10^-1
=akar 10^-10
=10^-5
POH = -log [H+]
= -log 10^-5
= 5
PH = 14 - POH
= 14 - 5
= 9.