Jawabanmu

2014-02-22T11:57:15+07:00
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 2,05 karena ada alasanya

2014-02-22T14:44:04+07:00
2. pH = 4 ---> [H+] = 1 x 10^-4 [H+] = derajat ionisasi x M asam 10^-4 = 0,005 x M asam M asam = 0,02 M [H+] = √ Ka x M asam 10^-4 = √ Ka x 0,02 (10^-4)^2 = Ka x 0,02 .. 10^-8 = Ka x 0,02 Ka = 5 x 10^-7