Saved Bookmarks
| 1. |
During estimation of nitrogen present in an organic compound by Kjeldahl's method, the ammonia evolved from 0.5g of the compound in Kjeldahl's estimation of nitrogen, neutralized 10 mL of 1M H_(2)SO_(4). Find out the percentage of nitrogen in the compound |
|
Answer» Solution :Mass of compound = m= 0.5g 10 ML 1M `H_(2)SO_(4)` = 20 mL 1M `NH_(3)` 100ML `1M NH_(3)`= 14 nitrogen `:.` 20 mL `1M NH_(3) = (20 mL xx 14g)/(1000 mL)` = 0.28g nitrogen `:. % N = ("weight of " N xx 100)/("mass of compound")` `= (0.28 xx 100)/(0.5) = 56%` |
|