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Nature of salts

Experiment 5: Nature of salts

Objective

Identification of the acidic/basic/neutral nature of the salt solutions

Materials required:

  • Ferric chloride
  • Sodium acetate
  • Sodium chloride
  • Test tubes
  • Dropper
  • Litmus papers

Procedure:

  • Take about 0.5g of ferric chloride solution (in a test tube and add 10ml of water to it.
  • Take a piece of blue litmus paper and dip it in this solution
  • Dip a piece of red litmus paper in the solution and observe the change
  • Repeat the above steps with sodium acetate solution and sodium chloride solution, respectively. Note the observations

Findings:

  • Ferric chloride solution turns blue litmus paper red, but it does not change the colour of red litmus paper
  • Sodium acetate solution turns red litmus paper blue but does not change the colour of blue litmus paper
  • Sodium chloride solution does not change the colour of either red or blue litmus paper

Conclusions:

  • Ferric chloride solution is acidic
  • Sodium acetate solution is basic
  • Sodium chloride solution is neutral

Theory:

  • Ferric Chloride dissolves in water to make Ferric Hydroxide (a weak base) and Hydrochloric Acid (a strong acid). Resultant solution is acidic in nature.
  • Sodium Acetate solution is basic
  • Sodium Chloride is a salt of strong acid (HCl) and Strong Base (NaOH), it is neutral
  • ACID TURNS BLUE LITMUS RED; BASE TURN RED LITMUS BLUE

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