How to Calculate Molarity in a Titration

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Titration is a process for finding the concentration of a chemical solution. Titration makes use of the physical evidence of a chemical reaction to determine the amount of a known chemical that is required to completely react with the unknown chemical. This can then be used to calculate how much of the unknown chemical there is in a given volume, essentially giving its molarity.

    Multiply the molarity of the known solution by the volume of the known solution. This information will be given to you in the problem, or if you are calculating this value by experiment, you will be able to measure these values. This is the number of moles of chemical in the solution.

    Count the number of H+ ions or OH- ions per molecule of the unknown chemical. The chemical will contain only one of these two ions, and the number can be obtained merely by looking at the subscript to the right of the ion.

    Divide the number of moles of the known chemical by the number of H+ or OH- ions in the chemical. This will give you the number of moles of unknown chemical.

    Divide the number of moles of unknown chemical by its volume. Again, the volume will be given in word problems or measured in experiments. This number is the molarity of your solution.


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