Question

Jika diketahui nilai Ka CH3COOH adalah 1,7x10^(-5), maka larutan CH3COONa 0,3 M akan mempunyai pH sebesar...
a. 3,22
b. 4,77
c. 5,32
d. 5,50
e. 6,20

Answer 1

Verified answer

#larutan hidrolisis
#hidrolisis parsial basa
#XI semester 2

CH3COOH + NaOH ----> CH3COONa + H2O
asam lemah + basa kuat --> garam + air

Reaksi hidrolisis :
CH3COO- + H2O <----> CH3COOH + OH-

OH- = akar Kw/Ka [G]
= akar 10-14/17.10-6 [3.10-1]
= akar 0,176.10-9
= 0,4195.10-4,5 M

pOH = 4,5 - log 0,4195
= 4,5 - (-0,3772)
= 4,5 + 0,3772
= 4,8772

pH = 9,1228



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