# Strong and Weak Acids

What is the difference between a strong acid and a weak acid? Give one example of each.
What is meant by the ionic product for water, Kw? Define pH and hence calculate the pH of a solution of
a) 0.01 M hydrochloric acid
b) 0.1 M sodium hydroxide
c) 0.2 M sulphuric acid
d) 0.1 M butanoic acid, given that Ka = 1.51 x 10-5

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#### Solution Preview

...can write a chemical equation and an equilibrium expression for this as follows.

H2O -> H+ + OH- Keq = [H+] [OH-]
[H2O]

Since [H2O] = 55.5M and is changed little by ionization, we can simplify it further

Kw = [H+] [OH-] = 1x10 -14

Define pH and hence calculate the pH of a solution of

OTA: The pH of a solution is a measure of it's concentration of H+

pH = -log [H+]

The pOH, which can be useful if you have the concentration of a base, is a measure of the concentration of OH-

pOH = -log [OH-]

This equation ...