# If the pH of a sample was 3, how many times more acidic is it than a sample with a pH of 6?

Sample 1 ($p H = 3$) is 1000 times as acidic as sample 2.
$p H$ $=$ $- {\log}_{10} \left[{H}^{+}\right]$. It follows that a $\Delta p H$ of $1$ corresponds to a tenfold difference in acidity, of $2$, a hundredfold difference, and $3$, a thousandfold difference: i.e. ${10}^{1}$, ${10}^{2}$, ${10}^{3}$.