Nilai pH untuk CH3COONA 0,4 M (ka=10'5 ;kw=10'14) adalah

CH3COONa 0,4 M
Ka = 10^-5
Kw = 10^-14

pH ... ?

CH3COONa => Na^{+} + CH3COO^-
..... 0,4 M .......... 0,4 M ...... 0,4 M

Garam CH3COONa bersifat basa
[OH^-] = √( Kw/Ka × M anion )
[OH^-] = √( 10^-14/10^-5 × 0,4 )
[OH^-] = √( 10^-9 × 0,4 )
[OH^-] = √( 4 × 10^-10 )
[OH^-] = 2 × 10^-5

pOH = - log [OH^-]
pOH = - log 2 × 10^-5
pOH = 5 - log 2

pH = 14 - pOH
pH = 14 - (5 - log 2)
pH = 14 - 5 + log 2
pH = 9 + log 2

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