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Notes 16.3

Notes 16.3. Acid/Base Titration. Acid-Base Titrations. A neutralization reaction is when there is equal amounts of H+ and OH- available for a reaction and a neutral solution (pH=7) will result. To analyze the acid/base content of a solution, titrations are often performed

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Notes 16.3

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  1. Notes 16.3 Acid/Base Titration

  2. Acid-Base Titrations • A neutralization reaction is when there is equal amounts of H+ and OH- available for a reaction and a neutral solution (pH=7) will result. • To analyze the acid/base content of a solution, titrations are often performed • A titration involves the delivery of a measured volume of a solution of known concentration ( the titrant ) into the solution being analyzed ( the analyte ). • The titrant contains a substance that reacts in a known way with the analyte. • If the analyte contains a base, the titrant would be a standard solution ( a solution of known concentration) of a strong acid.

  3. To run the titration the standard solution of titrant is loaded into a buret. • The buret is a cylindrical device that allows accurate measurement of the delivery of a given volume of liquid. • The titrant is added slowly to the analyte until exactly enough has been added to just react with all of the analyte. • This point is called the stoichiometric point or equivalence point for the titration. • For an acid/base titration the equivalence point can be determined with an indicator ( one that changes color near pH of 7) • Titration curve or pH curve changes very rapidly when the titration nears the equivalence point. ( page 584)

  4. Buffered Solutions • A buffered solution is one that resists a change in its pH even when a strong acid or base is added to it. • Buffered solutions are vitally important to living organisms whose cells can survive only in a very narrow pH range • A solution is buffered by the presence of a weak acid and its conjugate base.

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