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... was to identify an unknown weak acid. This was accomplished by titrating the unknown acid with a standardized base. Using a pH meter, the pH values were recorded as the volume of added base increased until the pH reached a specified limit of 11. From these values, the pKa(s) and molecular weight of the unknown could be determined; these defining characteristics could then be used to determine the identity of the unknown acid. EXPERIMENTAL: The first step of this experiment was the standardization of the NaOH solution. Three samples of KHP were weighed out, and then diluted in deionized water to obtain three solutions. A few drops of phenolphthalein were added to each solution, and then a titration using NaOH was performed; the volume of NaOH solution used was recorded for each titration. The average concentration of the NaOH solution was then calculated using these results. Once the NaOH solution had been standardized, ...