Page 52 - E-Modul Kimia Larutan Penyangga

E-MODUL KIMIA 2022

= ×
= 0,1 mol ×132

= 13,2 gram

9. Diketahui :

Perbandingan BL : A Konjugasi = 9:3
-5
K b = 1,8 × 10
Ditanya: pH campuran ?
Jawab:

;
[ ] = × ℎ

9
= 1,8 × 10 ;5 ×
3
= 1,8 × 10 ;5 × 3

= 5,4 × 10
;5
= − log[ ]
;
= − log 5,4 × 10
;5
= 5 − log 5,4

= 5 − 0,732
= 4,268

pH = 14 – POH
= 14 – 4,268

= 9,732

10. Diketahui :

M KOH = 0,2 M
V KOH = 1 L

M asam lemah = 0,4 M
V asam lemah = 1 L

pH = 5 – log 3

Ditanya: K a asam lemah ?
Jawab:

pH = 5- log 3
:
[ ] = 3 × 10
;5

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