1.

29.5mg of an organic compound containing nitrogen was digested according to Kjeldahl's method and the evolved ammonia was absorbed in 20mL of 0.1M HCl solution. The excess of for complete neutralization. The percentage of nitrogen in the compound is

Answer»

`23.7`
`29.5`
`59.0`
`47.4`

Solution :`underset((HCL))(M_(1)V_(1))=underset((NaOH))(M_(2)V_(2))`
`0.1xxV=0.1xx15`
`V_(HCl)=15ml`
`:.` Volume of `HCl` USED by `NH_(3)`
`=20-15=5ml`
`%` of `N=(1.4NV)/(W)`
`N=` Normality of acid used
`V=` Volume of acid used
`W=` wt. of organic compound
For `HCl`, normality `=` Molarity ( `:.` Basicity is `1`)
`%` of `N=(1.4xx0.1xx5)/(29.5xx10^(-3))=23.73%`


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