Year 10 Salt Preparation and analysis

Two solids, Q and R, which are both salts, were analysed. Solid Q was zinc bromide.
Tests were carried out on each solid.
tests on solid Q
Solid Q was dissolved in distilled water.
The solution was divided into three equal portions in three test-tubes, and the following tests were
carried out.
Complete the expected observations.
(a) (i) Drops of aqueous sodium hydroxide were added to the first portion of the solution until a
change was seen.
observations .................................................................................................................. [2]
(ii) Excess aqueous sodium hydroxide was then added to the mixture.
observations .................................................................................................................. [1]
(b) (i) Drops of aqueous ammonia were added to the second portion of the solution until a change
was seen.
observations .................................................................................................................. [1]
(ii) Excess aqueous ammonia was then added to the mixture.
observations .................................................................................................................. [1]
(c) Dilute nitric acid and aqueous silver nitrate were added to the third portion of the solution.
observations ......................................................................................................................... [2]


(d) Identify solid R. ............................................................................................................................................... [2] [Total: 9]

Two substances, solution M and solid N, were analysed. Solution M was aqueous iron(III) chloride.

Tests were done on the substances.

Complete the expected observations.

tests on solution M

(a) Describe the appearance of solution M.

............................................................................................................................................... [1]

Solution M was divided into three equal portions in three test-tubes.

(b) Dilute nitric acid and aqueous silver nitrate were added to the first portion of solution M.

observations ......................................................................................................................... [2]

(c) Dilute nitric acid and aqueous barium nitrate were added to the second portion of solution M.

observations ......................................................................................................................... [1]

(d) (i) Drops of aqueous sodium hydroxide were added to the third portion of solution M until a

change was seen.

observations .................................................................................................................. [2]

(ii) An excess of aqueous sodium hydroxide was then added to the mixture.

observations .................................................................................................................. [1]

(e) Name the gas produced in test 1.

.............................................................................................................................................. [1]

(f) Identify solid N.

............................................................................................................................................... [2]

[Total: 10]

Two substances, solution D and solid E, were analysed. Solution D was dilute sulfuric acid.

Tests were done on the substances.

tests on solution D

Complete the expected observations.

Solution D was divided into four equal portions in four test-tubes.

(a) The pH of the first portion of solution D was tested.

pH = .............................. [1]

(b) A strip of magnesium ribbon was added to the second portion of solution D. The gas produced

was tested.

observations ...............................................................................................................................

.....................................................................................................................................................

............................................................................................................................................... [3]

(c) Dilute nitric acid and aqueous silver nitrate were added to the third portion of solution D.

observations ......................................................................................................................... [1]

(d) Dilute nitric acid and aqueous barium nitrate were added to the fourth portion of solution D.

observations ......................................................................................................................... [1]

(e) Identify the gas produced in test 2.

............................................................................................................................................... [1]

(f) What conclusions can you draw about solid E?

............................................................................................................................................... [2]

[Total: 9]

A white solid is insoluble in water.

When it is added to hydrochloric acid, bubbles of gas are formed.

Adding aqueous ammonia to the solution formed gives a white precipitate. Adding excess aqueous ammonia causes the precipitate to re-dissolve.

What is the white solid?

• aluminium nitrate

• ammonium nitrate

• calcium carbonate

• zinc carbonate

Which two compounds give a white precipitate when their aqueous solutions are mixed?

• silver nitrate and sodium chloride

• silver nitrate and sodium iodide

• sodium hydroxide and copper(II) sulfate

• sodium hydroxide and iron(II) chloride

Two tests are carried out to identify an aqueous solution of X.

test 1 Aqueous sodium hydroxide is added and a blue precipitate is produced.

test 2 Dilute nitric acid is added followed by aqueous silver nitrate and a white precipitate is produced.

What is X?

• copper carbonate

• copper chloride

• iron(III) carbonate

• iron(III) chloride

Which gas relights a glowing splint?

• ammonia

• carbon dioxide

• hydrogen

• oxygen

Which statement about aqueous sodium hydroxide is correct?

• When it is added to a solution containing sulfate ions, a white precipitate is formed.

• When it is added to a solution of copper(II) ions, a blue precipitate is formed which dissolves in excess to give deep blue solution.

• When it is added to a solution of iron(II) ions, a green precipitate is formed which does not dissolve in excess.

• When it is added to ammonium chloride, a gas is produced which turns blue litmus red.

Aqueous sodium hydroxide is added to solid X and the mixture is heated. A green precipitate is formed and an alkaline gas is given off.

Which ions are present in X?

• NH4+ and Fe2+

• NH4+ and Fe3+

• OHandFe2+

• OHandFe3+

Which of these pairs of aqueous ions both react with dilute sulfuric acid to give a visible result?

• Ba2+ and Cl

• Ba2+ and CO32

• NH4+ and Cl

• NH4+ and CO32