Preparing a titration

Preparing a titration

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Credit: ANDREW LAMBERT PHOTOGRAPHY/SCIENCE PHOTO LIBRARY

Caption: MODEL RELEASED. Titration experiment preparation by a student. He is using the pipette-filler (red) in his right hand to fill a volumetric pipette with acid from the beaker. The use of a volumetric pipette allows the transfer of a known volume of acid to the conical flask. The burette (down left) contains an alkali of known concentration, and is used to add a measured volume to neutralise the acid. An acid-base indicator (phenolphthalein, lower left) indicates the reaction's endpoint by a colourless (acidic) to pink (alkaline) colour change. The known concentrations and volumes allow the calculation of the concentration of the acid.

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