Calculate the ph of a buffer that is 0.020 m hf and 0.040 m naf. the ka for hf is 3.5 × 10-4.

The given buffer solution is 0.020 M HF and 0.040 M NaF.

Given the of HF is

Finding out :

=

= 3.46

We use the Hendersen-Hasselbalch equation to find out the pH of a buffer solution:

[Base] =[NaF] = 0.040 M

[Acid] = [HF] =0.020 M

Plugging in the values to find out pH,

pH = 3.46 + log(2)

= 3.76

Therefore, pH of the buffer is 3.76

i believe it is c.) 1575 j.