0.35 g of an organic acid was kjeldahlised and the ammonia obtained was passed into 100 cm^(3) of N//5H_(2)SO_(4). The excess of the acid required 154 cm^(3) of N//10 NaOH for neutralisation. Calculate the percentage of nitrogen in the compound.

0.35 g of an organic acid was kjeldahlised and the ammonia obtained wa

1.	0.35 g of an organic acid was kjeldahlised and the ammonia obtained was passed into 100 cm^(3) of N//5H_(2)SO_(4). The excess of the acid required 154 cm^(3) of N//10 NaOH for neutralisation. Calculate the percentage of nitrogen in the compound.
Answer» Solution :Volume of unused ACID. `ubrace(N_(1)V_(1))_("Acid") EQUIV ubrace(N_(2)V_(2))_("Base")` `1/5xxV=1/10xx154` or `V=77 cm^(3)`. Step II. PERCENTAGE of NITROGEN. Volume of acid used `=100-77=23 cm^(3)` Percentage of `N=(1.4xx"Normality of acid used"xx"Volume of acid used")/("Mass of compound")=(1.4xx0.2xx23)/035=18.4 %`