4. 10 ml of NaOH solution are added to a 1.23 g sample of technical ammonium sulfate. The remaining alkali is titrated with 15 ml of 0.2144 mol-eq/l hydrochloric acid solution (1.0 ml of NaOH is equivalent to 4.5 ml of HCl). Calculate the mass fraction (%) of ammonium sulfate in the sample.

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