The chemistry and uses of acids, bases and salts

Which of the following describes a step in the preparation of insoluble barium sulfate from aqueous barium chloride and dilute sulfuric acid?

• Add dilute sulfuric until no more gas is produced

• Add universal indicator

• Collect the precipitate of barium sulfate by filtration

• Evaporate the filtrate until it crystallises

Which word describes the reaction between hydrochloric acid and sodium hydroxide?

• electrolysis

• neutralisation

• precipitation

• thermal decomposition

Strontium hydroxide is an alkali.

Which statement about aqueous strontium hydroxide is correct?

• The solution contains fewer hydrogen ions than hydroxide ions.

• The solution has a pH less than 7.

• The solution turns universal indicator red, orange and yellow.

• The solution turns blue litmus red.

The pH values of four aqueous solutions are shown.

Which solution contains a weak acid?

• pH 2

• pH 5

• pH 7

• pH 9

Which type of reaction takes place when H⁺ ions and OH^- ions react to form water?

• condensation

• ionisation

• neutralisation

• precipitation

Which of the following is an example of soluble salt?

• sodium chloride

• silver chloride

• magnesium carbonate

• calcium sulfate

What is the colour of Universal indicator when in an alkaline solution?

• green

• red

• orange

• purple

Which of the following methods can be used to prepare insoluble salts?

• decomposition

• neutralisation

• precipitation

• ionisation

Name type of compound present in salts

• covalent compound

• ionic compound

• metallic compound

• non-metallic compound

A salt is formed when a ............ chemically combined with a non - metal.