Hitunglah [H3O+] dan pH larutan0,5 M asam fluorida

hitunglah [H3O+] dan pH larutan0,5 M asam fluorida

Jawaban dari pertanyaan di atas adalah nilai [H3O+] atau [H+] yang dihasilkan adalah 6 x10^-5 dan pH yang dihasilkan adalah 5-log 6.

Simak pembahasan berikut ya.

Asam fluorida (HF) adalah asam lemah. Rumus dari asam lemah sebagai berikut:

[H+]= √Ka x Ma

[H+]=konsentrasi ion H+ dalam larutan.
Ka= tetapan asam lemah
Ma= molaritas asam

Perhitungan [H3O+] atau [H+] dan pH asam lemah dari larutan0,5 M asam fluorida:

Misal Ka HF=7,2×10^−11

[H+] = √Ka x Ma
[H+] = √7,2×10^−11 x 0,5 M
[H+] =√36 x10^-10
[H+] =6 x10^-5

pH=-log [H+] pH=-log (6 x10^-5)
pH= 5-log 6

Dengan demikian, nilai [H3O+] atau [H+] yang dihasilkan adalah 6 x10^-5 dan pH yang dihasilkan adalah 5-log 6.

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