1.

0.50 g of an organic compound was kjeldahlished. The ammonia evolved was passed in 50 cm^(3) of 1 N H_(2)SO_(4). The residual acid required 60 cm^(3) of N//2 NaOH solution. Calculate the pecentage of nitogen in the compound.

Answer» <html><body><p></p>Solution :Step I. calculation of volume of <a href="https://interviewquestions.tuteehub.com/tag/unused-7277696" style="font-weight:bold;" target="_blank" title="Click to know more about UNUSED">UNUSED</a> acid <br/> Volume of `NaOH` solution required `=<a href="https://interviewquestions.tuteehub.com/tag/60-328817" style="font-weight:bold;" target="_blank" title="Click to know more about 60">60</a> cm^(3)` <br/> Normality of `NaOH` solution `=1//2 N` <br/> Normality of `H_(2)SO_(4)` solution `= 1N` <br/> Volume of unused acid can be calculated by applying normality equation <br/> `ubrace(N_(1)V_(1))_("Acid")=ubrace(N_(1)V_(1))_("Base") <br/> 1xxV=1/2xx60=<a href="https://interviewquestions.tuteehub.com/tag/30-304807" style="font-weight:bold;" target="_blank" title="Click to know more about 30">30</a> cm^(3)` <br/> Step II. Calculation of volume of acid used <br/> Volume of acid added `=50 cm^(3)` <br/> Volume of unused acid `=30 cm^(3)` <br/> Volume of acid used `=(50-30)=20 cm^(3)` <br/> Step III. Calculating of percentage of nitrogen <br/> <a href="https://interviewquestions.tuteehub.com/tag/mass-1088425" style="font-weight:bold;" target="_blank" title="Click to know more about MASS">MASS</a> of compound `=0.50 g` <br/> Volume of acid used `=20 cm^(3)` <br/> Normality of acid used `= 1 N` <br/> <a href="https://interviewquestions.tuteehub.com/tag/persentage-2923290" style="font-weight:bold;" target="_blank" title="Click to know more about PERSENTAGE">PERSENTAGE</a> of `N=(1.4xx"Volume of acid used"xx"Normality of acid used")/("Mass of the compound")` <br/> `=(1.4xx20xx1)/0.50=56%`</body></html>


Discussion

No Comment Found

Related InterviewSolutions