Problem

A 1.219-g sample containing (NH4)2SO4, NH4NO3, and nonreactive substanceswas diluted to 20...

A 1.219-g sample containing (NH4)2SO4, NH4NO3, and nonreactive substances

was diluted to 200 mL in a volumetric flask. A 50.00-mL aliquot was made basic with strong alkali, and

the liberated NH3 was distilled into 30.00 mL of 0.08421 M HCl. The excess HCl required 10.17 mL of

0.08802 M NaOH for neutralization. A 25.00-mL aliquot of the sample was made alkaline after the

addition of Devarda’s alloy, and the NO3- was reduced to NH3. The NH3 from both NH4+ and NO3- was

then distilled into 30.00 mL of the standard acid and back-titrated with 14.16 mL of the base. Calculate

the percentage of (NH4)2SO4 and NH4NO3 in the sample.

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