Question

Aim: To study the physical and chemical properties of acetic (ethanoic) acid. Apparatus : Test tubes, test tube stands etc. Chemicals : Acetic acid, red and blue litmus solutions, sodium bicarbonate. Procedure : 1. Take 2-3ml of acetic acid in a clean, dry test tube. Note down its colour and odour. 2. Add 4-5ml water to the acetic acid in the test tube and mix well. 3. Take 2ml of acetic acid in a test tube and add blue litmus solution to it. Do the same pro for red litmus solution. Observe both the test tubes. 4. Take 2 ml of acetic acid in a test tube and add a pinch of sodium bicarbonate. Observation
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Answer 1

Answer:

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Procedure

ProcedureOdour

ProcedureOdourTake 5 ml of acetic acid in a test tube.

ProcedureOdourTake 5 ml of acetic acid in a test tube.Observe the colour and odour of given acid and note them in observation table.

Solubility in Water

Take 2 ml of water in a test tube and add 1 mL of acetic acid in it and shake it properly.

Take 2 ml of water in a test tube and add 1 mL of acetic acid in it and shake it properly.Observe the changes occur and write it in the observation table.

Effect on Litmus

Take a blue litmus paper strip and put a drop of acetic acid over it using a clean glass rod.

Answer 2

Answer:

CBSE Class 10 Science Lab Manual – Properties of Acetic Acid

February 1, 2018 by Veerendra

CBSE Class 10 Science Lab Manual – Properties of Acetic Acid

Aim

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

Odour

Solubility in water

Effect on litmus

Reaction with sodium bicarbonate

Materials Required

Test tubes, conical flask, delivery tube, glass rod, acetic acid, blue and red litmus paper or solution, distilled water, sodium hydrogen carbonate (NaHCO3), freshly prepared lime water.

Theory

An organic compound containing the carboxylic group (—COOH) is known as carboxylic acid. Acetic acid is an organic acid with the chemical formula CH3COOH. Its IUPAC name is ethanoic acid.

Acetic acid is present in vinegar. It can be obtained by wood tar distillation. It is sour in taste. It has a vinegar like smell. Vinegar, commonly called ‘Sirka’, is a dilute (4-5 percent) solution of acetic acid. Acetic acid is highly soluble in water because it gets ionised in aqueous solution and exhibits acidity.

CH3COOH (l)+ H2O (l) ——–> CH3COO–(aq)+ H3O+(aq)

The acidic property of acetic acid is due to the presence of carboxylic group (—COOH), which upon dissociation provide H+(or H3O+) ions. It turns blue litmus to red but does not affect red litmus.

Acetic acid reacts with sodium bicarbonate and gives brisk effervescence due to the formation of CO2gas. CO2 turns lime water milky due to the formation of insoluble calcium carbonate and the milkiness disappears if excess of CO2 is passed through the solution.

Explanation: