Harga pH campuran antara 100 ml larutan C6H5COOH 0,2 M dengan 100 ml larutan NaOH 0,1 M jika diketahui Ka C6H5COOH = 6x10⁻⁵ ...?

C6H5COOH = 0,2 M 

Volume [C6H5COOH] = 100 ml

mmol C6H5COOH = 100 x 0,2 = 20 mmol

NaOH = 0,1 M

Volume [NaOH] = 100 ml

mmol NaOH = 100 x 0,1 = 10 mmol

Ka C6H5COOH = 6x10^-5

C6H5COOH + NaOH => C6H5COONa + H2O

[H+] = 6x10⁻⁵ . 10/10

[H+] = 6x10⁻⁵

ph = -log[H+]

ph = -log 6x10⁻⁵

ph = 5 - 0,78

Jadi, harga ph campuran antara 100 ml larutan C6H5COOH 0,2 M dengan 100 ml larutan NaOH 0,1 M adalah 4,22 atau 5-log 6