[Gweedo8]

Can someone give me some directions as to how to reach the answer for this problem:

A 0.608g sample of fertilizer contained nitrogen as ammonium sulfate,

(NH4)2  SO4(s)+2NaOH(aq)->Na2SO4(aq) + 2H2O(l) +2NH3(g)

The ammonia was collected in 46.3 mL of 0.213 M HCL (hydrochloric acid), with which it reacted.

NH3(g)+HCL(aq)->NH4Cl(aq)

This solution was titrated for excess hydrochloric acid with 44.3 mL of 0.128 M NaOH

NaOH(aq)+HCL(aq)->NaCL(aq)+H2O(l)

What is the percentage of nitrogen in the fertilizer?

The answer is 9.66%

[sjb]

How much HCl was there in the solution that you titrated against NaOH?

How much HCl was there originally in the solution before you added ammonia?

How much HCl reacted with the ammonia?

How much ammonia did you have?