123. Задачка по химии №012 357

4. A sample of flour weighing 0.5863 g was processed according to the Kjeldahl method to determine the nitrogen content in it. The resulting ammonia was distilled off into a solution containing 20.00 cm3 of hydrochloric acid with a titer of 0.005475 g/cm3. 12.50 cm3 of sodium hydroxide solution with a titer equal to 0.008896 g/cm3 was used to neutralize the excess acid. Calculate the mass fraction of nitrogen in the analyzed flour sample.

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