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pH Scale
From the handout on pH scale (given during class) or from the website listed below, pH indicates the relative concentration of the hydronium ion ([H<sup>+</sup>] or [H<sub>3</sub><sup+</sup]). It is not the concentration of the acid molecule, [HA]. Since strong acids and weak acids ionize to different extent, you need to handle them different with respect to pH calculations.
pH with strong acids
Since strong acid ionize 100%, you can use stoichiometry to figure out the hydronium ion concentration (([H<sup>+</sup>] or [H<sub>3</sub><sup+</sup]). Once you find the hydronium ion concentration, you can use the pH equation given in the other handout or website below to determine the pH of the solution.
Example:What is the pH of a 0.025M HCl solution.