Potassium hydrogen phthalate is a solid, monoprotic acid frequently used in the

Question

Potassium hydrogen phthalate is a solid, monoprotic acid frequently used in the laboratory to standardize strong base solutions. It has the unwieldy formula of KHC8H4O4. This is often written in shorthand notation as KHP. What volume of a 0.233 M barium hydroxide solution is needed to exactly neutralize 2.58 grams of KHP ?

ANSWER: ______ mL barium hydroxide

A 14.0 g sample of an aqueous solution of hydrobromic acid contains an unknown amount of the acid. If 29.8 mL of 0.611 M potassium hydroxide are required to neutralize the hydrobromic acid, what is the percent by mass of hydrobromic acid in the mixture? % by mass

A 13.1 g sample of an aqueous solution of nitric acid contains an unknown amount of the acid. If 22.8 mL of 0.456 M potassium hydroxide are required to neutralize the nitric acid, what is the percent by mass of nitric acid in the mixture? % by mass

Explanation / Answer

Molecular weight of Potassium hydrogen phthalate = 204.22 g/mol

Number of moles of Potassium hydrogen phthalate = 2.58g/204.22 = 0.01263

Number of H+ ions to be neutralized = 0.01263

Let volume of barium hydroxide required be v litres.

Therefore, moles of barium hydroxide = v*0.233

Number of hydroxide ions furnished by v*0.233 moles of Barium hydroxide = 2*v*0.233

Finally, moles of H+ = moles of OH-

2*v*0.233 = 0.01263

v = 0.0271103 litres

Therefore, volume required = 27.11 ml

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