Answer the following questions related to salts and their preparations :

(a) What is a 'salt'?

(b) What kind of salt is prepared by precipitation?

(c) Name a salt prepared by a direct combination. Write an equation for the reaction that takes place in preparing the salt you have named.

(d) Name the procedure used to prepare a sodium salt such as sodium sulphate.

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Solution

(a) A crystalline compound NaCl that consists of sodium chloride is abundant in nature and is used especially to season or preserve food or in the industry. Also called common salt.

In chemistry, a salt is an ionic compound which is made up of two groups of oppositely charged ions. The ion with a positive charge is called a cation, and the one with a negative charge is called an anion. How many of each type of ion the salt has is important because the compound must have an overall electrical charge of zero - that is, an equal balance between the positive charge and negative charge.

(b) Insoluble salt is prepared by precipitation.

(c) Iron (III) chloride or Ferric chloride

$2 F e (heated) + 3 C l_{2} (dry) ⟶ 2 F e C l_{3}$

(d) By neutralizing sodium carbonate or sodium hydroxide with dilute sulphuric acid :

$N a_{2} C O_{3} + H_{2} S O_{4} ⟶ N a_{2} S O_{4} + H_{2} O + C O_{2}$

$2 N a O H + H_{2} S O_{4} ⟶ N a_{2} S O_{4} + 2 H_{2} O$

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Similar questions

Give the preparation of the salt shown in the left column by matching with the methods given in the right column.

Write a balanced equation for each preparation.

Salt Method of preparation

Zinc sulphate Precipitation

Ferrous sulphide Oxidation

Barium sulphate Displacement

Ferric sulphate Neutralisation

Sodium sulphate Synthesis.

H_{2} S O_{4}

X

A

Y

B

For each of the salt: A, B, C and D, suggest a suitable method for its preparation.

(a) A is a sodium salt.

(b) B is an insoluble salt.

(d) D is a soluble salt of zinc.

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