ACID BASE TITRATION
Titration.... The quantitative, measured addition of a solution of one chemical, the reagent, to react with another. Titration is a volumetric procedure.
Buret.......... A device used in titrations to measure the volume of reagent used.
End Point... The point at which the titration is stopped. The volume of reagent added is measured at this point.
Equivalence Point.... The point at which the added reagent just exactly reacts with the other.
Indicator...... A chemical added in small amounts to a titration which changes some physical property, usually color, when the equivalence point is reached. The color change signals that the titration process should end. The indicator is chosen to make the end point as close to the equivalence point as possible.
The chemicals you will use today are common materials which can be bought in a supermarket or a hardware store.
Sodium hydroxide may be purchased in a supermarket as Lye. Hydrochloric Acid can be purchased in a hardware store as Muriatic Acid. The indicator, phenolphthalein can also be purchased in the supermarket or drugstore. It was the active ingredient in EXLAX® and similar laxatives.
Acids and bases are common laboratory as well as household chemicals.
INFORMATION for Living:
© RWK 1997