Embedded Files
Download Math 30 SQPs pdf
Table of Contents
Aim
To study the following properties of acetic acid (ethanoic acid):
(i) odour (smell)
(ii) solubility in water
(iii) effect on litmus
(iv) reaction with sodium bicarbonate
Note: Chemical Equations on WHITE PAGES.
Materials Required
Test tubes, water, litmus paper, a test tube stand, a dropper, a beaker, and a cork fit in a test tube with a bent tube fixed in it.
Chemicals Required: Acetic acid (ethanoic acid), Distilled water, Sodium bicarbonate and Freshly prepared lime water.
Procedure
Dilute the given acetic acid with distilled water in a beaker.
Pour 5 ml of acetic acid into a test tube and perform the following tests:
I) Odour Test:
Experiment: Take 5 mL of acetic acid in a test tube and smell it by wafting.
Observation: It has a peculiar pungent smell, (vinegar-like smell).
Inference: Acetic acid has a vinegar-like smell.
II) Solubility in Water:
Experiment: Take 2 mL of acetic acid in a test tube, add 10-15 mL of water and shake.
Observation: It dissolves in water to form a homogeneous solution.
Inference: Acetic acid is soluble in water in all proportions.
III) Effect on Litmus:
Experiment: Use a clean dropper and pour 1-2 drops of acetic acid on blue litmus paper.
Observation: Blue litmus paper turns red.
Inference: Acetic acid turns blue litmus red.
IV) NaHCO₃ Test (Part-I):
Experiment: Take a pinch of sodium bicarbonate in a clean test tube and add 1 mL of dilute acetic acid into the test tube.
Observation: Reaction begins, brisk effervescence is seen, and a colourless gas is evolved.
Inference: Acetic acid and sodium bicarbonate react to liberate CO2 gas.
NaHCO₃ Test (Part-II):
Experiment: Fix a cork with the bent delivery tube in the mouth of the above test tube. Dip the other end of the delivery tube to a test tube containing lime water.
Observation: The gas turns lime water milky.
Inference: CO2 gas evolved above reacts with calcium hydroxide to form calcium carbonate which is insoluble in water.
Precautions
(Only two precautions are to be written and I have chosen these)
Acetic acid should be handled with care.
Use only freshly prepared lime water for the CO₂ test.
Google Sites
Report abuse