List the cation and anions of the substance given in the table. Substance Chemical formula Cation Anion Potassium chloride KCl K + Cl - Magnesium chloride MgCl 2 _____ _____ Sodium nitrate NaNO 3 _____ _____ Ammonium chloride NH 4 Cl _____ _____ Aluminium sulphate Al 2 ( SO 4 ) 3 _____ _____ Calcium phosphate Ca ( PO 4 ) 3 _____ _____

The cations are the positively charged species and the anions are the negatively charged species. They combine together to form ionic compounds or salts. Therefore, the cation and anions of the given substances can be listed as, Substance Chemical formula Cation Anion Potassium chloride KCl K + Cl - Magnesium chloride MgCl 2 Mg 2 + 2 Cl - Sodium nitrate NaNO 3 Na + NO 3 - Ammonium chloride NH 4 Cl NH 4 + Cl - Aluminium sulphate Al 2 ( SO 4 ) 3 2 Al 3 + 3 SO 4 2 - Calcium phosphate Ca ( PO 4 ) 3 Ca 2 + 3 PO 4 3 -

Match the columns by identifying the correct chemical formula and the use of the salts. Salt Chemical formula Use Washing soda CuSO 4 . 5 H 2 O Fire extinguisher Gypsum NaHCO 3 Fungicide Blue vitriol Na 2 CO 3 . 10 H 2 O Manufacture of Cement Baking soda CaSO 4 . 2 H 2 O Manufacture of Glass

Washing soda is a basic salt with the chemical formula Na 2 CO 3 . 10 H 2 O . It is mainly used in the manufacture of glass. Gypsum is a neutral salt with the chemical formula CaSO 4 . 2 H 2 O . It is mainly used in manufacturing cements. Blue vitriol is crystalline copper sulphate, CuSO 4 . 5 H 2 O which is used as a fungicide. Baking soda is a basic salt with the chemical formula NaHCO 3 . It is used as a fire extinguisher as it can liberate the carbon dioxide gas. Salt Chemical formula Use Washing soda Na 2 CO 3 . 10 H 2 O Manufacture of Glass Gypsum CaSO 4 . 2 H 2 O Manufacture of Cement Blue vitriol CuSO 4 . 5 H 2 O Fungicide Baking soda NaHCO 3 Fire extinguisher

The pH values of some substances are given in the table. Analyse the table and answer the question. Substance pH value Vinegar 4 . 2 Lime water 10 . 5 Milk 6 . 4 Water 7 Toothpaste 8 . 7 Blood 7 . 36 Is blood acidic or basic in nature?

Here, the pH value of blood is 7 . 36 . It means that, blood is slightly basic in nature. This range of pH value is important for maintaining an acid-base balance which helps in the proper body functions.

The pH values of some substances are given in the table. Analyse the table and answer the question. Substance pH value Vinegar 4 . 2 Lime water 10 . 5 Milk 6 . 4 Water 7 Toothpaste 8 . 7 Blood 7 . 36 The pH value of pure milk is 6 . 4 . Does the pH value increase or decrease when milk changes to curd. Justify your answer

Milk is slightly acidic in nature. Therefore, it has a pH value equal to 6 . 4 . Curd is produced from milk by the action of the lactic acid bacteria which results in the formation of lactic acid which in turns makes it more acidic. Therefore, we can say that the pH value decreases when milk changes into curd.

The pH values of some substances are given in the table. Analyse the table and answer the question. Substance pH value Vinegar 4 . 2 Lime water 10 . 5 Milk 6 . 4 Water 7 Toothpaste 8 . 7 Blood 7 . 36 Among the substances given in the above table (i) Which one is strongly basic? (ii) Which one has weak acidic nature?

(i) The substances having a pH value greater than 7 will be basic in nature. The basicity increases with an increase in the pH value. Therefore, here lime water is strongly basic in nature. (ii) The substances having a pH value less than 7 will be acidic in nature. That is, one with very low pH with be highly acidic in nature. That is, pH value decreases with an increase in the acidity. Therefore, here, milk is very slightly acidic in nature.

MEDIUM

9th Kerala Board

IMPORTANT

Earn 100

Write the equation for the reaction between magnesium hydroxide $[Mg {(OH)}_{2}]$ and dilute hydrochloric acid $HCl$ .

Important Questions on Acids, Bases, Salts

MEDIUM

9th Kerala Board

IMPORTANT

Chemistry Standard IX Part 2>Chapter 5 - Acids, Bases, Salts>Exercise 2>Q 3

Which is the acid required for the preparation of magnesium sulphate?

HARD

9th Kerala Board

IMPORTANT

Chemistry Standard IX Part 2>Chapter 5 - Acids, Bases, Salts>Exercise 2>Q 4

List the cation and anions of the substance given in the table.

Substance	Chemical formula	Cation	Anion
Potassium chloride	$KCl$	$K^{+}$	${Cl}^{-}$
Magnesium chloride	${MgCl}_{2}$	_____	_____
Sodium nitrate	${NaNO}_{3}$	_____	_____
Ammonium chloride	${NH}_{4} Cl$	_____	_____
Aluminium sulphate	${Al}_{2} ({SO}_{4})_{3}$	_____	_____
Calcium phosphate	$Ca ({PO}_{4})_{3}$	_____	_____

HARD

9th Kerala Board

IMPORTANT

Chemistry Standard IX Part 2>Chapter 5 - Acids, Bases, Salts>Exercise 2>Q 5

A little distilled water is taken in a beaker.

A. What is the $pH$ value of the distilled water?

B. What happens to the $pH$ value when the following substances are added to the water? Justify your answer.
i) Caustic soda
ii) Vinegar

HARD

9th Kerala Board

IMPORTANT

Chemistry Standard IX Part 2>Chapter 5 - Acids, Bases, Salts>Exercise 2>Q 6

Match the columns by identifying the correct chemical formula and the use of the salts.

Salt	Chemical formula	Use
Washing soda	${CuSO}_{4} . 5 H_{2} O$	Fire extinguisher
Gypsum	${NaHCO}_{3}$	Fungicide
Blue vitriol	${Na}_{2} {CO}_{3} . 10 H_{2} O$	Manufacture of Cement
Baking soda	${CaSO}_{4} . 2 H_{2} O$	Manufacture of Glass

EASY

9th Kerala Board

IMPORTANT

Chemistry Standard IX Part 2>Chapter 5 - Acids, Bases, Salts>Exercise 2>Q 7

The $pH$ values of some substances are given in the table. Analyse the table and answer the question.

Substance	$pH$ value
Vinegar	$4.2$
Lime water	$10.5$
Milk	$6.4$
Water	$7$
Toothpaste	$8.7$
Blood	$7.36$

Is blood acidic or basic in nature?

MEDIUM

9th Kerala Board

IMPORTANT

Chemistry Standard IX Part 2>Chapter 5 - Acids, Bases, Salts>Exercise 2>Q 7

The $pH$ values of some substances are given in the table. Analyse the table and answer the question.

Substance	$pH$ value
Vinegar	$4.2$
Lime water	$10.5$
Milk	$6.4$
Water	$7$
Toothpaste	$8.7$
Blood	$7.36$

The $pH$ value of pure milk is $6.4$ . Does the $pH$ value increase or decrease when milk changes to curd. Justify your answer

HARD

9th Kerala Board

IMPORTANT

Chemistry Standard IX Part 2>Chapter 5 - Acids, Bases, Salts>Exercise 2>Q 7

The $pH$ values of some substances are given in the table. Analyse the table and answer the question.

Substance	$pH$ value
Vinegar	$4.2$
Lime water	$10.5$
Milk	$6.4$
Water	$7$
Toothpaste	$8.7$
Blood	$7.36$

Among the substances given in the above table
(i) Which one is strongly basic?
(ii) Which one has weak acidic nature?

HARD

9th Kerala Board

IMPORTANT

Chemistry Standard IX Part 2>Chapter 5 - Acids, Bases, Salts>Exercise 2>Q 1

Organic acids are present in a number of substances we use in our daily life.

(e.g. Tomato, orange, apple, grapes, curd, etc.)

Identify the organic acids in each of them and tabulate.

Write the equation for the reaction between magnesium hydroxide MgOH2 and dilute hydrochloric acid HCl.

Important Questions on Acids, Bases, Salts

Learn and Prepare for any exam you want !

Write the equation for the reaction between magnesium hydroxide $[Mg {(OH)}_{2}]$ and dilute hydrochloric acid $HCl$ .