HF <---> H+ + F-
Ka = [H+][F-]/[HF]
[H+] = 10^-2.1 = 7.94X10^-3 M = [F-]
Ka = 3.5X10^-4 = (7.94X10^-3)^2 / [HF]
[HF] = 0.18 M
Massa HF = 0.18 mol/L X 0.5 L = 0.09 mol HF X 20 g/mol = 1.8 gramas HF
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HF <---> H+ + F-
Ka = [H+][F-]/[HF]
[H+] = 10^-2.1 = 7.94X10^-3 M = [F-]
Ka = 3.5X10^-4 = (7.94X10^-3)^2 / [HF]
[HF] = 0.18 M
Massa HF = 0.18 mol/L X 0.5 L = 0.09 mol HF X 20 g/mol = 1.8 gramas HF