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A gallon of lemon juice has a pH of 2.25. If all the acid in the...

A gallon of lemon juice has a pH of 2.25. If all the acid in the juice is derived from citric acid (H3C6H5O7), what is the mass/volume % of citric acid in the juice?
(1 gal = 3.785 L)
(Ka = 7.4 * 10-4)

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