Answered: back titration done for this analysis?

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back titration done for this analysis?

Chemistry: Matter and Change

1st Edition

ISBN:9780078746376

Author:Dinah Zike, Laurel Dingrando, Nicholas Hainen, Cheryl Wistrom

Publisher:Dinah Zike, Laurel Dingrando, Nicholas Hainen, Cheryl Wistrom

Chapter18: Acids And Bases

Section: Chapter Questions

Problem 59A: Explain the meaning of the relative sizes of the two shaded areas to the right of the dark vertical...

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Question

%N in sample can be obtained by converting all N containing compounds to NH₃. The generated NH₃ is then reacted with excess HCl and excess HCl is backtitrated with NaOH.

Why is back titration done for this analysis?

a.Titration with strong acid and strong base will produce sharper endpoint than titration with strong acid and weak base.

b.Nitrogen compounds will only react with excess acids.

c.Backtitration will be faster than doing direct titration.

d.NH₃ is a weak base and large amount of titrant is needed to reach equivalence point.

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