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ka = 10^-5
pH = 3
ditanya : M?
pH = - log [H+]
3 = - log [H+]
[H+] = 10^-3
[H+] = akar(Ka . M) -> pakai rumus ini krn CH3COOH asam lemah
10^-3 = akar(10^-5 . M) -> kedua ruas dipangkatkan 2
10^-6 = 10^-5 . M
M = 10^-1