Question

Hitung pH campuran 100mL C6H5COOH 0,2 M + 100 mL NaOH 0,1 M. Ka C6H5COOH = 6×10 pangkat mines 5 !

Answer 1

[H+] = ka (mol asam-mol basa)/ mol basa
        = 6x10-5 (20-10)/10
        = 6x10-5
pH = 5-log 6
      = 4,22

diketahui mol asam 0,2M x 100 mL = 20mol
mol basa 0,1M x 100mL = 10mol