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Mastering Acid-Base Titration Methods

Explore the intricate process and importance of titration in determining unknown acid or base molarity. Learn about standard solutions, indicators, endpoint detection, titration curves, and the usage of burets. Enhance your knowledge in general chemistry.

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Mastering Acid-Base Titration Methods

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  1. Acid-Base Titration & pHChapter 15A West Valley High School General Chemistry Mr. Mata

  2. Essential Question: • How is titration used to determine the molarity of an unknown acid or base?

  3. Acid –BaseTitration • Titration = method to determine the concentration of an unknown acid or base. • Standard solution = solution of known concentration (molarity). • Endpoint = point at which neutralization occurs. • Endpoint usually shown by color change of an acid-base indicator.

  4. Indicators • Indicators • compounds that change their molecular configuration in the presence of acids or bases. • Indicators appear to change color when placed in different concentrations of acids and bases. • Phenolphthalein • colorless in the presence of an acid and magenta in the presence of a base. • Universal Indicator • displays a spectrum of colors, depending upon acid and base concentration.

  5. Indicator Use • Some indicators are better suited to different acid/base reactions. • Transition interval • the range of pH that they are effective. • End point • point where indicator changes from one color to another. • mole H+= moles OH-(endpoint = 7)

  6. Titrations • Titrations allow us to analytically determine an acid or base concentration (M). • Titrations are far more precise than indicators. • Titrations are performed by adding a known amount of a known-concentration acid to an unknown base or… • Adding a known amount of a known-concentration base to an unknown acid.

  7. Titration Curves • Titration curves can show how pH of a titration (acid-base solution) changes as one compound is added to the other. • The equivalence point is the point at which: • mole acid = mole base

  8. Buret Used in Acid-Base Titrations

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