In this article, we have discussed step-by-step procedure to perform CBSE Class 10 Science Practicals experiment Properties of acetic acid. It will help you understand the different properties of ethanoic acid viz, odour (smell), solubility in water, effect on litmus, reaction with sodium bicarbonate. Perform the experiment and compare the results.
To study the following properties of acetic acid (ethanoic acid)-
- Odour (Smell)
- Solubility in water
- Effect on litmus
- Reaction with sodium bicarbonate
- Test tube
- Litmus paper
- Cork fit
- Test tube stand
- Acetic acid
- Sodium bicarbonate
- Distilled water
- Lime water (freshly prepared)
The chemical name of acetic acid is ethanoic acid and has a chemical formula CH3COOH. The COOH group is called the carboxylic group which is responsible for the properties of ethanoic acid. This acid freezes at 16.6° C hence called as glacial acetic acid. It smells like vinegar and dissolves in water. It is a weak acid as it dissociates in water. It reacts with alcohol to obtain ester. It reacts with sodium bicarbonate to give carbon dioxide gas.
- To determine the odour:
Step 1: Take a test tube of 10 mL.
Step 2: Add 5 mL of ethanoic acid into it
Step 3: Bring the test tube near your nose and smell it by wafting.
- To check the solubility in water:
Step 1: Take a test tube of 20 mL.
Step 2: Add 2 mL of ethanoic acid to it
Step 3: Pour 10-15 mL of distilled water and mix it.
- To determine the effect on litmus:
Step 1: Take a clean dropper
Step 2: Take a blue litmus paper
Step 3: Pour 2-3 drops of ethanoic acid on the litmus paper.
- Reaction with sodium bicarbonate:
Step 1: Take a test tube of 5 mL.
Step 2: Add a pinch of sodium bicarbonate to it
Step 3: Pour 1 mL of dilute ethanoic acid in the test tube.
Step 4: To the mouth of the test tube fix a cork with bent delivery tube
Step 5: The other end of delivery tube is required to be dipped in lime water.
Observation and results:
|Determination of odour||Pungent/vinegar smell|
|Checking its solubility in water||Dissolves in water|
|Determining the effect on litmus||Blue litmus paper turns red|
|Reaction with sodium bicarbonate||A colourless gas is produced which turns the lime water milky|
- Ethanoic acid or acetic acid or glacial acetic acid smells like vinegar.
- Glacial acetic acid is water-soluble.
- Ethanoic acid turns blue litmus paper red.
- When acetic acid reacts with sodium bicarbonate, carbon dioxide gas liberated.
Precautions to be taken during the experiment:
- Handle the solution with care.
- Add a small amount of sodium bicarbonate.
- Do not inhale the vapours of the chemicals.
- Lime water should be freshly prepared.
1. The functional group present in ethanoic acid is _________.
Ans: Carboxylic group.
2. At what temperature glacial acetic acid freezes?
Ans: 16.6° C.
3. How do you determine if acetic acid is an acid?
Ans: During the litmus test, if the blue litmus paper turns red then it is said to have acidic properties.
4. Acetic acid is a strong acid. True or false?
5. The alkyl group present in acetic acid is _______.