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Acidity of Carboxylic Acids

Write the bal...

Question

Write the balanced equation for the preparation of the following salts in the laboratory: (c) An insoluble base by the action of a soluble base on a soluble salt

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Solution

When lead nitrate (soluble salt) reacts with sodium carbonate it produces lead carbonate which is insoluble and basic in nature. The balanced equation for the reaction is, $P b (N O_{3})_{2} + N a_{2} C O_{3} \to P b S O_{4} + 2 N a N O_{3}$

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Write the balanced equations for the preparation of the following salts in the laboratory :

(a) A soluble sulphate by the action of an acid on an insoluble base,

(b) An insoluble salt by the action of an acid on another salt,

(c) An insoluble base by the action of a soluble base on a soluble salt,

(d) A soluble sulphate by the action of an acid on a metal.

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.

(c) C is a soluble salt of copper.

(d) D is a soluble salt of zinc.

Q. Give the name of a soluble lead salt and write the equation for the action of heat on this salt. Write the equation for the preparation of nitric acid from potassium nitrate.

The following is a list of methods for the preparation of salts.

A - direct combination of two elements.

B - reaction of a dilute acid with a metal.

C - reaction of a dilute acid with an insoluble base.

D - titration of a dilute acid with a solution of soluble base.

E - reaction of two solutions of salts to form a precipitate.

Choose from the above list A to E, the best method of preparing the following salts by giving a suitable equation in each case :

1. Anhydrous ferric chloride, 2. Lead chloride,

3. Sodium sulphate, 4. Copper sulphate.

Salts are prepared by the following methods

(a) Direct combination

(b) Displacement

(c) Double decomposition (precipitation)

(d) Neutralisation of insoluble base

(e) Neutralisation of an alkali (titration)

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Acidity of Carboxylic Acids

Standard XII Chemistry

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