181. A portion of the test technical sample containing ammonium salt was heated with a certain volume (V NaOH) of titrated sodium hydroxide solution until ammonia was completely removed. A certain HCl (V HCl) was used to neutralize the excess alkali. Determine the mass fraction of ammonia in the sample.

Table 9

Problem No. Sample weight, g Volume of NaOH, cm3 Concentration of NaOH Volume of HCl, cm3 Concentration of HCl
181 0.3217 50.00 N=0.09815 24.00 T=0.004746 g/cm3

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