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(0,1 x ka)^1/2 = 0,001
0,1 x ka = 0,000001
ka = 10^-5
pH HA = pH HCl
pH HA = 3
- log [H⁺] = 3
[H⁺] = 0,001
[H⁺] = √Ka [HA]
Ka = [H⁺]²
[HA]
Ka = (0,001)^2 / 0,1
= 10 ^ -6 x 10
= 10 ^ -5