About us | Feedback

pH calculation - questions

pH questions

BATE pH calculator

operating systems:
XP, Vista, 7, 8, 10

single user license price:
€24.95 - approximately $33

Buy Now!

By clicking Buy Now! you will continue to the FastSpring checkout page where payment will be taken, and your order fulfilled by FastSpring, our trusted reseller, and Merchant of Record.

download 30-day free trial!
30-day money back guarantee!

pH calculation questions » pH of buffer solution

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

AdSense

Chemical calculator software for pH calculation, concentration conversion solution preparation and chemical equation balancing chemical calculator