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 :
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)
Therefore, pH of the buffer is 3.76
the answer to your question is c