suatu larutan mengandung 0,525 gram HOCl tiap liternya. jika harga Ka= 3x10^-8 maka pH larutan adalah.........
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suatu larutan mengandung 0,525 gram HOCl tiap liternya. jika harga Ka= 3x10^-8 maka pH larutan adalah.........
2 Jawaban
-
1. Jawaban Yahiko
Diketahui :
asam lemah HOCl (Ka = 3 x 10⁻⁸)
M = (m/Mr) x (1000/V)
M = (0,525/52,5) x (1000/1000)
M = 0,01 M = 10⁻² M
[H⁺] = √(Ka . M)
[H⁺] = √(9 x 10⁻⁸ . 10⁻²)
[H⁺] = √(9 x 10⁻¹ᴼ)
[H⁺] = 3 x 10⁻⁵ M
pH = -log [H⁺]
pH = -log (3 x 10⁻⁵)
pH = 5 – log 3 -
2. Jawaban niftitarahma
[OH-]=√kw/ka . [G]
=√1.10^-14/3.10^-8 . 525.10^-3
=√1575.10^-9
=39,6.10^-3
pOH= - log [OH-]
= - log 39,6.10^-3
= 3-log 39,6
pH=14-(3-log39,6)
= 11 - log 39,6