pH of Strong Acids Calculations Tutorial
- A strong acid is one that dissociates completely in water to form hydrogen ions1:
acid → hydrogen
+ anions HA → H+ + A-
- For a strong monoprotic acid, an acid that contains only 1 hydrogen atom that can dissociate, the concentration of hydrogen ions in solution is only dependent on the concentration of the original acid.
+ anion HA → H+ + A- [HA] = [H+] = [A-]
Square brackets, [ ], are Chemist′s short-hand for concentration in mol L-1 (molarity or molar concentration).
- pH is a measure of the hydrogen ion, or proton, (H+) concentration in a solution.
- pH of a solution is calculated using the formula (equation):
pH = -log10[H+]
where [H+] is the concentration of hydrogen ions in mol L-1 (mol/L or M)2