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A solution of an unknown acid is prepared by dissolving 0.250 g of the unknown in...

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Chemistry

A solution of an unknown acid is prepared by dissolving 0.250 gof the unknown in water to produce a total volume of 100.0 mL. Halfof this solution is titrated to a phenolphthalein endpoint,requiring 12.2 mL of 0.0988 M KOH solution. The titrated solutionis re-combined with the other half of the un-titrated acid and thepH of the resulting solution is measured to be 4.02. What is arethe Ka value for the acid and the molar mass of the acid?

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4.1 Ratings (840 Votes)
Half of the solution is titrated to a phenolphthalein endpoint and recombined with the other half of the untitrated acid This implies that this solution is equivalent to a solution    See Answer
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