sebanyak 30 gram CH3COOH (mr=60) dicampur dengan CH3COONa (mr=82) kemudian ditambah air hingga 250 ml, pH larutan menjadi 5. Jika ka CH3COOH= 1×10^-5 , maka CH3COONa yg ditambah sebesar

Materi : Asam Basa
Sub materi : Larutan Penyangga
Kata kunci : penyangga, buffer

[CH3COOH]: 30/60 × 1000/250 = 2 M

pH = 5 —-> [H+] = 10^-5 M

Gunakan rumus lar. penyangga asam

10^-5 = 10^-5 × 2/[CH3COONa]
[CH3COONa] = 2 M

Berat CH3COONa yg dilarutkan:
250/1000 × 2 × 82 = 41 gram

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