Acids, bases and buffers

3 important questions on Acids, bases and buffers

A solution at 25 degrees celcius has a pH of 5.12. Wat is [OH-]?

  • pH + pOH = 14
  • 5.12 + pOH = 14
  • pOH = 8.88


  • pOH = -log[OH-]
  • 8.88 = -log[OH-]
  • [OH-] = 1.3 x 10^-9 M

H2PO4 can act as an acid, but also as a base. The pKa of this particle is 7.21. What is the pKb of the same particle?

We can't tell with this info

When in a buffer nHA = nA then the pH will be:

Equal to the pKa of HA

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