Difference Between Direct Titration and Back Titration
Titration
Titration
can be defined as “a process in which a solution of known concentration is used
to find out the concentration of unknown solution”. Titration is also called as Titrimetry. The
solution of known concentration is termed as “Titrant” and it must be fall in
category of primary or secondary standards.
Moreover the solution of unknown concentration but of known volume is
termed as “Analyte or Titrate”. During titration Indicator are used that
produce color changes when a chemical change occur.
Direct Titration
Direct
titration method is the most commonly used method used to carry out titration. This
technique involves the reaction of unknown chemical with the known
concentration chemical. The reaction between the known chemical and unknown
chemical takes place directly. Hence the endpoint of titration indicates the
endpoint of that reaction.
Indirect Titration
Indirect
Titration is also termed as Back Titration. In Back titration the concentration
of unknown chemical is determined by determining the remaining amount of the
chemical of known concentration.
Back
titration involves two steps, in 1st step the reaction occur between
the chemical of interest with the known amount of reactant that will be added
in excess amount.
In
the 2nd step a simple titration would be carried out to find out the
amount of freely available reactant that was added in excess.
Difference between Direct Titration and Back Titration
|
Direct
Titration |
Back Titration |
|
1.The concentration
of unknown analyte is determined directly |
1.Assessment of the
unknown concentration by determining the excessive amount of known
concentration of analyte |
|
2.In direct titration
single reaction takes place |
2.In back
titration two reactions takes place |
|
3.In direct
titration the titration involves an unknown analyte |
3.In back
titration the titration is performed of two known compounds |
|
4.In direct
titration the titrand is the unknown compound |
4.In back
titration the titrand is the remaining excessive amount of added reagent |
|
5.Direct titration
is used when the end point can be easily obtained |
5.Back titration is used to determine the exact end point upon sharp color change |
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