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[H+]= akar kw . ka/ kb
[H+]= akar 10^-14 . 10^-8 / 10^-5
[H+] = akar 10^-17
[H+] = 10^-8,5
pH = -log [H+]
pH = -log 10^-8,5
pH = 8,5
jawaban nya D
maaf kalo salah