Question

Hitunglah ph campuran antara 200 ml larutan HNO2 0,15m dengan 150 ml larutan KOH 0,10 m ( ka= 10^-5

Answer 1

Awal 30 mmol 15 mmol
- -
Reaksi 15 mmol 15 mmol 15
mmol. 15 mmol
Sisa. 15 mmol. - 15
mmol 15 mmol

HNO2 = V.M
15 mmol = 350 mL . M

M = 15/350 = 0,04 M

[H+] = √Ka. Ma

= √10^-5 . 4. 10^-2

= √4.10^-7

= 2√10^-7

pH = -log [H+]

= -log (2.*10^-3.5)

= 3,5 - log 2



semoga bermanfaat :)