Class 10 Notes | EduRev

Science Class 10

Class 10 : Class 10 Notes | EduRev

The document Class 10 Notes | EduRev is a part of the Class 10 Course Science Class 10.
All you need of Class 10 at this link: Class 10

Our Objective

To study the following properties of acetic acid (ethanoic acid):

  • Odour
  • Solubility in water
  • Effect on litmus
  • Reaction with sodium bicarbonate

The Theory

What you know about acetic acid?Acetic acid is an organic acid with the formula CH3-COOH. Its functional group is carboxylic acid group.
 Class 10 Notes | EduRev

 Class 10 Notes | EduRevAcetic acid is a monocarboxylic acid because it contains only one "COOH"group. It has a sour taste and pungent smell. It is the main component of vinegar. Vinegar is typically 3-7% solution of acetic acid in water. Vinegar is mainly used as a preservative in food and in the pickling of vegetables. Water free acetic acid is known as glacial acetic acid.

What are the properties of acetic acid?

  1. Acidic character
  2. When dissolved in water, acetic acid undergoes dissociation to form hydrogen (H+) ion. Because of the release of a proton, acetic acid has an acidic character. It turns blue litmus paper red, indicating that it is acidic in nature. However, it is a weak acid because it does not dissociate completely in aqueous solution.
     Class 10 Notes | EduRev
  3. Reaction with sodium bicarbonate
  4. Acetic acid reacts with sodium bicarbonate to produce carbon dioxide.
     Class 10 Notes | EduRev
  5. On passing CO2 gas through lime water, the lime water turns milky. The milky appearance of lime water is due to the formation of solid calcium carbonate (CaCO3).
     Class 10 Notes | EduRev


Common uses of acetic acid:

  • Acetic acid is used as coagulant in the manufacture of rubber.
  • It is used in the manufacture of various dye stuffs and perfumes.
  • It is used in the manufacture of rayon fibre.
  • It is used as a solvent.

Learning Outcomes

  1. Students understand the chemical properties of acetic acid after this experiment.
  2. Students acquire skills to perform & visualize the reaction of acetic acid with the following.
    • Water
    • Litmus paper
    • Sodium bicarbonate
  3. Students will be able to properly use glassware like thistle funnel, delivery tubes, etc., in the real lab.
  4. Based on acquired skills, the student will be able to analyze a given sample & recognize it as acetic acid.

Materials Required:
 Class 10 Notes | EduRev


Procedure: 

Try the experiments below and observe the different properties of acetic acid in a real lab:

Experiment
Observation
Inference
Odour:Take a small amount of acetic acid in a test tube and detect its odour by wafting.
Pungent smell.
It has an irritating pungent smell.
Solubility in water: Take a small amount of water in a test tube and add a small amount of acetic acid to it and shake well.
A homogeneous solution is formed.
Acetic acid is soluble in water.
Effect on litmus:Take a small amount of acetic acid in a test tube and dip a strip of blue litmus paper in it.
Blue litmus turns red.
It is acidic in nature.
Reaction with sodium bicarbonate: Take a small quantity of sodium bicarbonate solution in a boiling tube. Cork the tube with a double bore cork and insert a thistle funnel into the tube. Then place a boiling tube containing lime water near the tube containing NaHCO3 solution. Insert one end of the delivery tube into the tube containing NaHCO3solution and the other end into the tube containing lime water. Now, add acetic acid into NaHCO3 solution through the thistle funnel and observe the change in colour of the lime water.
A gas is evolved which turns lime water milky
The gas produced is carbon dioxide due to the action of CH3COOH on NaHCO3, which turns lime water milky.


To perform the experiments using the simulator. 

You can select the test by clicking on the corresponding icon.

Solubility in water

  • To pour acetic acid into water, drag the test tube towards the test tube containing water.
  • To shake the test tube, click on it.
  • You can see the inference by clicking on the inference icon.
  • Click on the ‘Reset’ button to redo the test.

Odour

  • You can see the inference by clicking on the inference icon.
  • Click on the ‘Reset’ button to redo the test.

Effect on litmus

  • To take acetic acid, drag the dropper towards the test tube and dip it in the test tube.
  • To put acetic acid on the blue litmus paper, drag the dropper towards it.
  • You can see the inference by clicking on the inference icon.
  • Click on the ‘Reset’ button to redo the test.

Reaction with NaHCO3

  • To pour acetic acid into sodium bicarbonate solution, drag the conical flask towards the thistle funnel.
  • You can see that some gas bubbles are produced inside the test tube containing sodium bicarbonate.
  • You can see the inference by clicking on the inference icon.
  • Click on the ‘Reset’ button to redo the test.

Note: Click on the ‘HELP’ button to see the instructions.

Precautions:

  • Never smell acetic acid directly.
  • Keep the mouth of the test tube away from you and your classmates' face.
  • Use the chemicals judiciously.
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