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Tentukan sifat larutan (asam, basa, atau netral) dan harga pH beberapa larutan garam berikut! (Ka HCN = 6,2 × 10^−10, Ka HF = 6,6 × 10^−4, Ka CH3COOH = 1,8 × 10^−5, Kb NH4OH = 1,8 × 10^−5) c. CH3COONH4

Tentukan sifat larutan (asam, basa, atau netral) dan harga pH beberapa larutan garam berikut!
(Ka HCN = 6,2 × 10^−10, Ka HF = 6,6 × 10^−4, Ka CH3COOH = 1,8 × 10^−5, Kb NH4OH = 1,8 × 10^−5)
c. CH3COONH4

Jawaban yang benar adalah sifat garam tersebut adalah netral dan nilai pH nya yaitu 7.

Garam yang terbentuk dari asam lemah dan basa lemah dapat mengalami hidrolisis total. Reaksi hidrolisis total akan menghasilkan ion H+ dan ion OH- sehingga sifat larutan ditentukan oleh nilai tetapan ionisasi asam (Ka) dan tetapan ionisasi basa (Kb).
– Jika nilai Ka > Kb –> larutan garam bersifat asam –> pH < 7
– Jika nilai Ka < Kb –> larutan garam bersifat basa –> pH > 7
– Jika nilai Ka = Kb –> larutan garam bersifat netral –> pH = 7

Larutan CH3COONH4 merupakan garam yang berasal dari basa lemah NH4OH dan asam lemah yaitu CH3COOH sehingga dalam air CH3COONH4 akan mengalami hidrolisis total.
CH3COO- + H2O ⇌ CH3COOH + OH-
NH4+ + H2O ⇌ NH4OH + H+
Dari data diatas, nilai Ka = Kb maka larutan tersebut bersifat netral dengan nilai pH = 7.

Jadi, sifat garam tersebut adalah netral dan nilai pH nya yaitu 7.

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