Titration

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This is a powerpoint requirement for our Computer Fundamentals subject, and I thought of making a ppt about Titration

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Titration

  1. 1. Titration Florendo, Marvin Ray R.
  2. 2. Titration  Titration, also known as titrimetry, is a common laboratory method of quantitative chemical analysis that is used to determine the unknown concentration of an identified analyte.  Because volume measurements play a key role in titration, it is also known as volumetric analysis. Florendo, Marvin Ray R.
  3. 3. Titration  A reagent, called the titrant or titrator is prepared as a standard solution.  A known concentration and volume of titrant reacts with a solution of analyte or titrand to determine concentration. Florendo, Marvin Ray R. Indicator Acid Base Titration
  4. 4. Titration  Titration is a procedure used in chemistry in order to determine the molarity of an acid or a base.  A chemical reaction is set up between a known volume of a solution of unknown concentration and a known volume of a solution with a known concentration. Florendo, Marvin Ray R.
  5. 5. Titration  The relative acidity (basicity) of an aqueous solution can be determined using the relative acid (base) equivalents. An acid equivalent is equal to one mole of H+ or H3O+ ions. Similarly, a base equivalent is equal to one mole of OH- ions.  Keep in mind, some acids and bases are polyprotic, meaning each mole of the acid or base is capable of releasing more than one acid or base equivalent. Florendo, Marvin Ray R.
  6. 6.  When the solution of known concentration and the solution of unknown concentration are reacted to the point where the number of acid equivalents equals the number of base equivalents (or vice versa), the equivalence point is reached.  The equivalence point of a strong acid or a strong base will occur at pH 7. For weak acids and bases, the equivalence point need not occur at pH 7. There will be several equivalence points for polyprotic acids and bases. Florendo, Marvin Ray R.
  7. 7. How to Estimate the Equivalence Point?  There are two common methods of estimating the equivalence point: 1. Use a pH Meter For this method, a graph is made plotting the pH of the solution as a function of the volume of added titrant. Florendo, Marvin Ray R.
  8. 8. How to Estimate the Equivalence Point? • 2. Use an Indicator
 • This method relies on observing a color change in the solution. Indicators are weak organic acids or bases that are different colors in their dissociated and undissociated states. Because they are used in low concentrations, indicators do not appreciably alter the equivalence point of a titration. The point at which the indicator changes color is called the end point. Florendo, Marvin Ray R.
  9. 9. How to Estimate the Equivalence Point? • For a properly performed titration, the volume difference between the end point and the equivalence point is small. Sometimes the volume difference (error) is ignored; in other cases a correction factor may be applied. The volume added to achieve the end point may be calculated using this formula: • VANA = VBNB
where V is volume, N is normality, A is acid, and B is base. Florendo, Marvin Ray R.
  10. 10. Florendo, Marvin Ray R.

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