Qualitative Analysis

How is the presence of chloride ions tested?

• acidify then add silver nitrate (aq)

• acidify then add barium nitrate (aq)

• add sodium hydroxide and aluminium foil, then warm

• add dilute acid

Dilute hydrochloric acid is added to an unknown salt, followed by barium chloride. Name the white ppt formed.

Tags

NGSS.MS-PS1-2

A white crystalline solid, X, is heated with aqueous sodium hydroxide and aluminium. A piece of red litmus paper, held near the mouth of the test-tube, remains red while the mixture is heated for several minutes.

Which conclusion must be correct?

• An acidic gas was given off.

• X is acidic.

• X is magnesium.

• X is not ammonium chloride.

Tags

NGSS.MS-PS1-2

A solid is insoluble in water but dissolves in aqueous alkali without evolution of a gas. What could the solid be?

• Copper (II) carbonate

• Copper(II) hydroxide

• Zinc carbonate

• Zinc hydroxide

In both experiments, a precipitate was obtained which dissolved in an excess of the added reagent. What could X contain?

• Copper (II) nitrate

• Iron(II) nitrate

• Iron(III) nitrate

• Zinc nitrate

Which ion, in aqueous solution, forms a white precipitate when dilute sulfuric acid is added?

• Ag+

• Ba2+

• Cu2+

• Fe2+

A metallic ion in aqueous solution produces

(i) white precipitate with aqueous sodium hydroxide, soluble in excess to produce a colourless solution.

(ii) white precipitate with aqueous sodium hydroxide, soluble in excess to produce a colourless solution.

What is the metallic ion?

• Al3+

• Ca2+

• K+

• Zn2+

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

Excess aqueous sodium hydroxide is added to salt X and the solution is heated. A gas is given off which turns red litmus blue.

When this reaction is complete, aluminium foil is added to the solution. A gas is gain given off which also turns red litmus blue.

What is salt X?

• ammonium nitrate

• ammonium sulfate

• zinc nitrate

• zinc sulfate

Tags

NGSS.MS-PS1-2

After acidification with dilute nitric acid, a colourless solution of X reacts with aqueous silver nitrate to give a white precipitate. What could X be?

• Calcium iodide

• Copper(II) chloride

• Lead(II) iodide

• Sodium chloride

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

Which of the following steps is NOT part of qualitative analysis?

• Cation tests

• Heat tests

• Melting point test

• Solubility