BATE - simple pH calculator

Single user license: €24.95

Operating systems: XP, Vista, 7, 8, 10, 11

Buy Now
Download

Use acetic acid and sodium acetate to prepare 0.01 M buffer solution with pH 4.50. pKa=4.75.

We can easily calculate ratio of concentrations of acid and conjugate base, by plugging known values of pH and pKa into the Henderson-Hasselbalch equation and rearranging:

eq. 15.215.2

[A-]/[HA] = 10pH-pKa = 104.50-4.75 = 0.562

0.01 M buffer means sum of concentrations of acetic acid and acetate is 0.01 M:

[HA] + [A-] = 0.01 M

We have two equations in two unknowns, solving them requires just a basic algebra skills and yields

[HA]=0.0064 M

[A-]=0.0036 M

pH questions

pH lectures

©2005 - 2022 ChemBuddy