HCl is a strong acid, so in solution, it will release all the H+ ions that are in the molecule. Therefore, the concentration of HCl acid will be equal to the concentration of H+ ions.
The concentration of H+ ions can be found by means of the pH equation that says:
[tex]pH=-log\lbrack H^+\rbrack[/tex]where [H+] is the concentration (Molarity) of H+ ions (Hydronium).
By clearing the concentration of H+ we have:
[tex]\lbrack H^+\rbrack=10^{-pH}[/tex]We replace the value of pH into the equation:
[tex]\lbrack H^+\rbrack=10^{-3}M=0.001M[/tex]Answer: the hydronium concentration of an HCl solution with a pH of 3.0 is 0.001M
