how is back-titration different from regular ? (what I want know us what is in the burette and conical flask in each case.)
plz help and thank you!
Answers
Explanation:
In a direct titration, you add a standard titrant to the analyte until you reach the end point.
In a back titration, you add an excess of standard titrant to the analyte, and then you titrate the excess titrant to determine how much is in excess.
It is often preferable to do a back titration if
one of the reactants is volatile and some might escape during the titration (e.g., NH₃)
the analyte is an insoluble salt (e.g., CaCO₃)
a particular reaction is too slow
direct titration would involve a weak acid-weak base titration (difficult to observe the end point
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