Acid – Base titrations.ppt - Acid – Base titrations Definitions • An acid-base titration involves a neutralization reaction in which an acid is

Acid – Base titrations.ppt - Acid – Base titrations...

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Acid – Base titrations
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Definitions An acid-base titration involves a neutralization reaction in which an acid is reacted with an equivalent amount of base. By constructing a titration curve, we can easily explain how the endpoints of these titrations can be detected The end point signals the completion of the reaction A titration curve is constructed by plotting the pH of the solution as a function of the volume of titrant added
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Standard solutions The standard reagents used in acid/base titrations are always strong acids or strong bases. Weak acids and bases are never used as standard reagents because they react incompletely with the analyte Most commonly used are HCl, HClO 4 , H 2 SO 4 , NaOH and KOH
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Detection of End points Many subsatnces are used as acid/base indicators An acid/base indicator is a weak organic acid or a weak organic base whose undissociated form differs in color from its conjugate base or its conjugate acid form. E.g. for an acid type indicator Hin, HIn + H 2 O ↔ In - + H 3 O + Acid color base color
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The equilibrium for a base type indicator In, is In + H 2 O ↔ InH + + OH - base color Acid color
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STRONG ACID VERSUS STRONG BASE In case of a strong acid versus a strong base, both the titrant and the analyte are completely ionized.
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  • Fall '19
  • patrick chibuye
  • pH, Acid-Base Titration

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