Calculate the mass fraction of ammonia in a sample weighing 5.5 g if this sample is diluted with water in a 200 ml volumetric flask. Titration of an aliquot part of a solution of this substance with a volume of 10.0 ml consumed 12.17 ml of titrant of sulfuric acid (c1/zT) = 0.075 mol/l. Write: a) reaction scheme; b) factors of equivalence of participants of reaction; c) the expression of the law of equivalents for this reaction; d) type of chemical reaction (titration method); e) indicator for determination of equivalence point (choice to explac)