3
$\begingroup$

When conducting a Kjeldahl analysis, ammonium sulfate is formed from nitrogen which protein consist of.

How in a picture of formation of ammonium sulfate there is involved no nitrogen but only some compounds containing nitrogen.

enter image description here

$\endgroup$
2
$\begingroup$

Ammonia is basic so: $$\ce{NH3 +H+<=>NH4+}$$ Sulphuric acid is acidic(since it's name is itself so acidic!): $$\ce{H2SO4<=>H+ +HSO4- <=>2H+ +SO4^2-}$$ Now the final reaction would be like: $$\ce{2NH3 +H2SO4<=>NH3 +NH4+ +HSO4- <=>2NH4+ +SO4^2- <=>(NH4)2SO4}$$ And remeber since proteins are polymers of peptides which itself are molecules consisiting of both a carboxylic ($\ce{-COOH/-COO-}$) and amino ($\ce{-NH3/-NH4+}$) group, therefore with strong heating ammonium sulfate is expected.

$\endgroup$

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.