Strong acid
A strong acid is an acidic compound which ionizes completely in an aqueous solution.
HA(aq) <math> \to <math> H+(aq) + A-(aq)
pH is the measure of acidity. It is defined for aqueous solutions as the -log10[H+], the negative of the log10 of the concentration of hydrogen (or more accurately, hydronium H3O+) ions in solution. Pure water at Standard temperature and pressure has an equilibrium concentration of one hydronium ion (and therefore one hydroxide ion) per 10,000,000 water molecules (M = 10-7 ) and thus has a pH of 7.
Acidic solutions have a pH lower than 7.
Basic solutions have a pH higher than 7.
Examples of strong acids:
