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back titration

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cootcoot:
i really just dont understand the whole concept.
can anyone explain it please?

iamdan08:
Back titrations are used when one of the reactants in a titration are volatile substances (such as ammonia) or when a weak acid is being titrated with a weak base (or vice versa) and the end point is very hard to determine accurately by normal titration.

beezy4eva:
and nearly every single back titration question you come across will be on lawn fertiliser :)

doboman:
DUE TO NH3 BEING A WEAK ACID..:d

Mao:
in some titrations, as the acid or base is really weak and the endpoint is not clear, it is far easier doing it the back way:

in the same way that you prepare the solution for straight titrations, this time you add in a known amount (and known concentration) of strong acid/base so all of the weak base/acid neutralised with some excess. This excess is then determined by titration. Since you know how many moles of the strong acid/base you have added, knowing the excess means you can calculate how much weak base/acid you have, except this time you have a clear end-point.

hope that helped

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