Question

Calculate the PH of buffer containing 0.05M NaF per litre and 0.015 M HF per litre

Answer 1

Answer:

ph = 3.6612

Explanation:

Ka =7.2 x 10

10g Ka = -410g10 + 10 g 7.2

= -4 x 1 + 0.8573

= -4 + 0.8573

Pk a = 3.1427

PH = pka + log [salt]

                         [acid]

=3.1427 + 10g (0.05)/(0.015)

=3.1427 + 10g 50/15

=3.1427 + 10g 3.3

=3.1427 + 0.5185

PH = 3.6612