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The percentage by weight of nitric acid, HNO3, in a sample of concentrated nitric acid is...

The percentage by weight of nitric acid, HNO3, in a sample of concentrated nitric acid is to be determined.

a. Initially a NaOH solution was standardized by titration with a sample of potassium hydrogen phthalate, KHC8H4O4, a monoprotic acid often used as a primary standard. A sample of pure KHC8H4O4 weighing 1.518 grams was dissolved in water and titrated with the NaOH solution. To reach the equivalence point, 26.90 millilitres of base was required. Calculate the molarity of the NaOH solution. (Molecular weight: KHC8H4O4 = 204.2)

b. A 10.00 millilitre sample of the concentrated nitric acid was diluted with water to a total volume of 500.0 millilitres. Then 25.00 millilitres of the diluted acid solution was titrated with the standardized NaOH solution prepared in part (a). The equivalence point was reached after 28.35 millilitres of the base had been added. Calculate the molarity of the concentrated nitric acid.

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