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Dr. Lavelle might give us a multistep question to involves both fundamentals as well as acids and bases. So he might first ask for us to calculate the molarity of a solution by only giving us the amount of substance and the total volume of the solution, and then ask us to find the pH of the solution.
In order to calculate the pH of an aqueous solution you will need to know the concentration of the hydronium ion in Molarity. pH=-log[H30+]. For example if given the problem pH of a 0.0025 M HCl. pH= -log(0.0025) = 2.60. Similar process with pOH, but you must know the concentration of the hydroxide in Molarity.
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