Edexcel 2g - Making soluble salts

What is the purpose of using a pipette filler?

• To add indicator

• To measure the acid

• To draw alkali into the pipette

• To wash the pipette

Which indicator is mentioned as suitable for titration?

• Litmus paper

• Universal indicator

• Phenolphthalein

• Bromothymol blue

What is the titre in a titration?

• The initial volume of acid

• The final volume of alkali

• The difference between the first and second readings on the burette

• The amount of indicator used

What should be done after obtaining concordant results in a titration?

• Repeat the experiment

• Add more indicator

• Stop the experiment

• Change the acid

Which of the following is a soluble base?

• Copper oxide

• Ammonia

• Calcium carbonate

• Iron(III) oxide

Why should universal indicator not be used in titration?

• It reacts with the acid

• It does not have a specific color change at the end-point

• It is too expensive

• It is not soluble in water

What is the next step after mixing exact volumes of acid and base without an indicator?

• Warm the solution until the point of crystallization

• Filter the solution

• Add more acid

• Add more base

How can you test for the point of crystallization?

• By dipping a glass rod in the solution

• By adding more acid

• By using a pH meter

• By measuring the temperature

What should be done if crystals form on the glass rod?

• Add more acid

• Cool the solution

• Heat the solution further

• Add more base

What is a common example of making a soluble salt from an insoluble base and an acid?

• Mixing sodium chloride with water

• Mixing copper oxide with sulfuric acid

• Mixing ammonia with hydrochloric acid

• Mixing calcium carbonate with nitric acid