Common names of some substances are given below. Find out the chemical formulae, chemical names and the uses of these substances, and write them in the table given below: Common Name Formula Chemical Name Use Caustic soda Caustic potash Baking soda Washing soda Limestone Quicklime Lime water Plaster of Paris Blue vitriol (neela thotha)

The chemical formulae, chemical names and the uses of these substances are given in the table below: Common Name Formula Chemical Name Use Caustic soda NaOH Sodium hydroxide It is an alkali and has several uses. It is used in manufacture of everyday products like: paper, aluminium, drain cleaners, soap and detergents. Caustic potash KOH Potassium hydroxide It is used to destroy calves horns. It helps get rid of the scales and hair. Baking soda NaHCO 3 Sodium Bicarbonate. Baking soda releases carbon dioxide when heated. As the name suggests it is a vital component in the baking industry providing fluffiness to cakes and breads. It is also used in toothpastes as a whitening agent, manufacture of diaper rash creams and deodorants. Washing soda NaCO 3 . 10 H 2 O Sodium carbonate decahydrate As the name suggests washing soda is commonly used in detergents. It is also used in treatment of hard water. Limestone CaCO 3 Calcium carbonate. Limestone is a popular building material. It is also used in purification of iron in blast furnaces. It is also used in manufacture of glass and cement. Quicklime CaO Calcium oxide Quicklime is used in a wide variety of applications, including the manufacture of iron and steel, the manufacture of paper and pulp, the treatment of water and flue gases and the mining industry. Lime water Ca ( OH ) 2 Calcium hydroxide It is used in a process known as lime softening to reduce water hardness. Plaster of Paris CaSO 4 . 1 2 H 2 O Calcium sulphate hemihydrate It is used in medicine for making plaster casts for fixing the affected part organ where there is a bone fracture Blue vitriol (neela thotha) CuSO 4 . H 2 O ` Copper sulphate It is used stopping the growth of fungus and bacteria.

E M B I B E

The Living World A book of Science and Technology>Chapter 4 - Acids, Bases and Salts>Something To Know>Q 1

MEDIUM

7th CBSE

IMPORTANT

Earn 100

All alkalies are bases but all bases are not alkalies. Justify this statement.

Important Questions on Acids, Bases and Salts

MEDIUM

7th CBSE

IMPORTANT

The Living World A book of Science and Technology>Chapter 4 - Acids, Bases and Salts>Something To Know>Q 2

Suggest an activity that can help one to decide whether a given solution is acidic or basic in nature.

MEDIUM

7th CBSE

IMPORTANT

The Living World A book of Science and Technology>Chapter 4 - Acids, Bases and Salts>Something To Know>Q 3

Write chemical equation for the following reaction:

Calcium hydroxide reacts with nitric acid.

MEDIUM

7th CBSE

IMPORTANT

The Living World A book of Science and Technology>Chapter 4 - Acids, Bases and Salts>Something To Know>Q 3

Write chemical equation for the following reaction:

Acetic acid reacts with calcium hydroxide.

MEDIUM

7th CBSE

IMPORTANT

The Living World A book of Science and Technology>Chapter 4 - Acids, Bases and Salts>Something To Know>Q 3

Write chemical equation for the following reaction:

Hydrochloric acid reacts with sodium hydroxide.

MEDIUM

7th CBSE

IMPORTANT

The Living World A book of Science and Technology>Chapter 4 - Acids, Bases and Salts>Something To Know>Q 3

Write chemical equation for the following reaction:

Ammonium hydroxide reacts with sulphuric acid.

MEDIUM

7th CBSE

IMPORTANT

The Living World A book of Science and Technology>Chapter 4 - Acids, Bases and Salts>Something To Know>Q 4

State the difference between neutral, acidic and basic salts. Give one example of each.

MEDIUM

7th CBSE

IMPORTANT

The Living World A book of Science and Technology>Chapter 4 - Acids, Bases and Salts>Something To Know>Q 5

Describe an activity to show that solutions of salts, in water, can conduct electricity.

MEDIUM

7th CBSE

IMPORTANT

The Living World A book of Science and Technology>Chapter 4 - Acids, Bases and Salts>Something to do>Q 1

Common names of some substances are given below. Find out the chemical formulae, chemical names and the uses of these substances, and write them in the table given below:

Common Name	Formula	Chemical Name	Use
Caustic soda
Caustic potash
Baking soda
Washing soda
Limestone
Quicklime
Lime water
Plaster of Paris
Blue vitriol (neela thotha)

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