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The figure below simulates the titration of a weak acid with a strong base. An unknown quantity of propionic acid has been dissolved in the beaker of water along with some phenolpthalein indicator. The burette is filled with 0.280 M NaOH solution. Carry out the titration of this sample by clicking on the stopcock handle. (Approach the endpoint carefully, you should be able to find it to the nearest 0.2 mL. If you overshoot you can reset and repeat).
What is the mass of propionic acid in the beaker? (Units are required.)
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