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Chemistry · L4 · Choosing Back Titration Over Direct Titration

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A decision guide for recognising when a direct acid–base titration won't work, and reaching for the excess-and-subtract back-titration method instead.

by @openstemUpdated Chemistry
Need to find how much ofa substance reacted, or its purityCan the analyte be titrateddirectly from a burette?Soluble, reacts fast and cleanly,sharp endpoint availableWhy not?Analyte is an insoluble solid(e.g. CaCO3 in rock or a tablet)Reaction with the titrantis too slow for a stable endpointNo indicator gives a sharp,reliable colour changeAnalyte is volatile or unstableUse DIRECT titrationUse BACK titration:known excess, react to completion,titrate the leftover, then subtractYesNo

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