## At A Glance

### 8.4.4 Deduce changes in [H+] when pH of a solution changes by more than one pH unit IB Chemistry SL

pH is a logarithmic scale (a change of one pH unit really means a factor of 10 change in [H+]) If a solution of pH 1 is diluted 10 fold it will now be pH = 2. If a solution of pH 1 is diluted 100 fold it will now be pH =3 If a solution of pH 1 is diluted 1000 fold it will now be pH=4 If a solution of pH 1 is diluted 10,000 fold it will now be pH=5 So what is the [H+] change when pH goes from 12 to 9? Since each pH "jump" is a factor of 10, and the pH changes by 3 "jumps" then the [H+] changes by10x10x10 = 1000 times increase in [H+]. OR pH 12, [H+] = 10^-12M, pH 9, [H+]=10^-9M, so [H+] has increased by a factor of 1000. Dr Atkinson's coat was ruined. The alien now sneezes into a bucket of NaOH(aq) through a straw.
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