Saponification

Q.

Question 15
Explain the mechanism of cleansing action of soaps.

Q.

(a) Explain the process of preparation of soap in the laboratory.
(b) Why is common salt (sodium chloride) added during the preparation of soap?
(c) Why is soap not suitable for washing clothes when the water is hard?

Q.

What are the raw materials required for making soap in a laboratory (or at home)?

Q.

Soaps are prepared by alkaline hydrolysis of _______.

1. carboxylic acids

2. aldehydes

3. esters

4. alcohols

Q.

The alkaline hydrolysis of oils and fats is called:

1. Decarboxylation

2. Esterification

3. Saponification

4. Acidic dehydration

Q. The hydrolysis of an ester in presence of an alkali is known as saponification.

1. True
2. False

Q.

Soaps are sodium salts of fatty acids. Which of the following fatty acids does not form soap-

1. Butyric acid

2. Oleic acid

3. Palmitic acid

4. Stearic acid

Q.

Define soaps.

Q. Sodium acetate is formed when ___ reacts with ethanoic acid.

1. sodium hydroxide
2. sodium
3. sodium bicarbonate
4. sodium carbonate

Q.

The hydrocarbon which can react with sodium in liquid ammonia is :

Q.

Soaps are Sodium/ Potassium salts of long-chain fatty acids, whereas synthetic detergents are Sodium salt of sulphonic acids.

1. True
2. False

Q.

The chemical which is not required for the preparation of soap in the laboratory is :

(a) vegetable oil (b) baking soda (c) caustic soda (d) common salt

Q.

Soaps are made up of:

1. Limestone and soda

2. Sodium bicarbonate and silica

3. Sodium and potassium salts

4. Calcium sulphate and salts

Q. Give a word equation for making of soap

Q.

Define the following terms giving one example of each. (i) Esterification (ii) Addition reaction

Q. The X and Y in the given equation respectively are:
$C{H}_{3}COO{C}_2{H}_5\stackrel{NaOH}{\to }X+Y$

1. Ethanol and Sodium acetate
2. Methanol and Acetic acid
3. Ethanol and Methanoic acid
4. Ethanol and Ethanoic acid

Q. About manufacturing of salts

Q.

Sodium acetate is formed when ___ reacts with ethanoic acid

Q. Which silicon compound is used in the removal of hardness of water?

1. Silica gel
2. Sand
3. Silicon carbide
4. Zeolite

Q.

Write the chemical equations of the reactions of ethanoic acid with sodium.

Q.

What are the products of the reaction, $C{H}_{3}COOH+N{a}_{2}C{O}_3\to$ ?

1. $C{H}_{3}COONa,C{O}_2,H_{2}O$

2. $NaOH,C_2{H}_{5}OH,O_2,H_{2}O$

3. $NaOH,C_2{H}_{4}OH,C{O}_2,H_{2}O$

4. $C{H}_{3}COONa,H_{2}O$

Q. Anisha wanted to create soap, she mixed with sodium hydroxide to obtain ethanol and sodium acetate.

1. washing soda
2. ethyl ethanoate
3. methyl ester
4. sodium ethoxide

Q. what is the difference between baking soda and baking powder

Q.

What does soaps consists of

Q.

Discuss briefly two physical and three chemical properties of ethanol. [5 MARKS]

Q.

Choose the statement which best describe ester:

Statement 1: Ester is formed due to the reaction between ethanol and Ethanoic acid.

Statement 2: Esters are sweet smelling substances.

Statement 3: Ester is formed due to the reaction between an acid and a carboxylic acid.

Statement 4: On treating with sodium hydroxide, ester is converted back to alcohol and sodium salt of carboxylic acid.

Statement 5: Preparation of soap involves treating of sodium hydroxide with ester.

1. Statement 1 is correct.

2. Statements 1, 2, 4 and 5 are correct.

3. Only statement 3 is correct.

4. Only statements 1, 2 and 5 are correct.

Q. The chemical which is not required for the preparation of soap in the laboratory is:

(a) vegetable oil
(b) baking soda
(c) caustic soda
(d) common salt

Q.

The X and Y form the above equation respectively are:

$C{H}_{3}COO{C}_2{H}_5$ $\stackrel{NaOH}{\to }$X + Y

1. Ethanol and Acetic acid

2. Ethanol and Methanoic acid

3. Ethanol and Methanol

4. Methanol and Acetic acid

Q.

Sodium acetate is formed when ___ reacts with ethanoic acid

Q. Hydrogen from alcohol is displaced by Sodium because it is more reactive than Hydrogen.

1. True
2. False