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Reaction of Metals with Water

Which acid is...

Question

Which acid is used in the laboratory preparation of zinc sulphate and ferrous sulphate salts?

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Solution

Sulphuric acid is used in the laboratory preparation of salts such as zinc sulphate and ferrous sulphate. [0.5 Mark]

In this method, sulphuric acid is treated with active metals to give salt and hydrogen hydrogen gas. [0.5 Mark]

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Q. Some methods used for the laboratory preparation of salts are:
(a) Metal + acid
(b) Carbonate + acid
(c) Precipitation (double decomposition)
(d) Direct combination
(e) Titration
Copy and complete the following table:

Salt	Method of Preparation
Ammonium sulphate Calcium carbonate Iron (III) chloride Lead nitrate Zinc sulphate	E

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.

Q. Write equations for the laboratory preparation of the following salts, using sulphuric acid:
(i) iron (II) sulphate from the iron.
(ii) copper sulphate from copper.
(iii) lead sulphate from lead nitrate.
(iv) sodium sulphate from sodium carbonate.

Q. From the list of the substances given, name the substances which you would use to prepare each of the following salts:
List of substances: copper, lead, sodium, zinc, copper oxide, lead carbonate, sodium carbonate solution, dilute hydrochloric acid, dilute nitric acid and dilute sulphuric acid.
Salts: (a) zinc sulphate (b) copper sulphate (c) sodium sulphate (d) lead sulphate.

Write the equation for the laboratory preparation of the following salt using sulphuric acid: Iron (II) sulphate using Fe.

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