calculatign the ph of solution?
A solution that is made by combining 125mL of 0.050 M hydrofluoric acid with 50.0mL of 0.10 M sodium fluoride.
calculate the ph of this solution
- hcbiochemLv 79 years agoFavorite Answer
For HF, pKa = 3.17
Moles HF = 0.125 L X 0.05 mol/L = 6.25X10^-3 mol
moles F- = 0.050 X 0.10 mol/L = 5X10^-3 mol
Using the Henderson-Hasselbalch equation gives:
pH = pKa + log [F-]/[HF]
pH = 3.17 + log (5X10^-3 / 6.25X10^-3) = 3.07