Titration of a weak acid with a strong base

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Titration of a weak acid with a strong base

Introduction: A weak acid is an acid that dissociates incompletely and does not release all of its hydrogens in a solution i.e. it does not completely donate all of its protons. These acids have higher pKa compared to strong acids, which release all of their hydrogens when dissolved in water.

A strong base is a basic chemical compound that is able to deprotonate very weak acids in an acid-base reaction. Compounds with a pKa of more than about 13 are called strong bases.

Titration: An acid-base titration is the determination of the concentration of an acid or base by exactly neutralizing the acid/base with an acid or base of known concentration.

Aim: To titrate a weak acid using NaOH(aq) with the concentration of 0.200 mol/dm3.

                HA + NaOH – – – > A-  + Na+ + H2O

                                              < ---------

Material:

  • Stand
  • Clamps
  • Burette (50 ml)
  • Voll pipette (25 ml)
  • Beaker
  • 50 ml of NaOH
  • 25 ml of weak acid
  • pH meter
  • magnet
  • magnetic stirrer
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Method:

  1. The burette was attached to the stand with the help of a clamp.
  2. The burette was then closed and 50 ml of NaOH was poured in.
  3. 25 ml of weak acid was poured into a beaker with the help of a voll pipette and a magnet was dropped inside.
  4.  The beaker was then placed on the magnetic stirrer and the stirrer was turned on.
  5. The pH meter was calibrated using buffer solutions of pH = 4, and pH = 7.
  6. The electrode of the pH meter was then flushed with water and inserted in the beaker ...

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