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How many grams of benzoic acid (C6H5COOH) must be dissolved in 250 mL of water to have a solution with a pH of 3 .PH=

How many grams of benzoic acid (C6H5COOH) must be dissolved in 250 mL of water to have a solution with a pH of 3 .PH= 3.60 ? (Ka=3105)

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