12. Решение задачки по химии №22

58. What mass of 2,5-dinitrophenol C6H3(OH)(NO2)2 should be taken to determine nitrogen using the Kjeldahl method so that the released ammonia can be absorbed by 50.00 ml of 0.2 N H2SO4 (feq=1/2) and the excess acid can be titrated with 20.00 ml of 0.2000 M NaOH?

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