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3. Suppose 0.200 moles of weak acid, HX, is dissolved in enough water to make 500.0mL of solution. This solution gives a pH of 2.85.

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3. Suppose 0.200 moles of weak acid, HX, is dissolved in enough water to make 500.0mL of solution. This solution gives a pH of 2.85. Calculate the Ka of the acid. 4. Hydrogen phthalate ion is a weak acid with a Ka of 3.9106. If you dissolve 2.55g of potassium hydrogen phthalate, KC2H5O4 in enough water to make 250.0mL, what is the pH

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