AcidBase Titration Titration is a chemical analysis involving
Acid-Base Titration • Titration is a chemical analysis involving the addition of a known concentration of titrant to a known volume but unknown concentration of sample. • Acid-Base titration, involves a reaction between an acid and base resulting in the production of water and a salt (neutralization). • In a titration, an indicator is used to determine the end point of the reaction. • At the end point, the indicator will change colour. • The equivalence point or stoichiometric point occurs when equal moles of hydronium and hydroxide ions have been reacted to produce water. • The equivalence point is not always equal to the end point and does not always occur at a p. H of 7. • When choosing an indicator for a titration, one tries to chose an indicator that will change when the equivalence point is reached.
Indicators – organic molecules with the ability to change colour depending upon the p. H of a solution. Titration Between a Strong Acid and Base • The equivalence point will occur at a p. H of 7. • Want an indicator that will change around 7. Titration Between a Weak Acid and Strong Base • The equivalence point will occur at a p. H above • Want an indicator that will change above 7. Titration Between a Strong Acid and Weak Base • The equivalence point will occur at a p. H below 7. • Want an indicator that will change below 7.
- Slides: 2