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Acids, bases and salt preparations

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Question 35

Dilute hydrochloric acid can be used to make soluble and insoluble salts.

a.

A student plans an experiment to obtain a pure, dry sample of the soluble salt, potassium chloride, from dilute hydrochloric acid.

The student does a titration to find the volume of hydrochloric acid needed for complete reaction with the other reactant.

Describe the steps she should take in her titration. Refer to these pieces of apparatus in your answer:

  • pipette
  • burette
  • conical flask
[5]
b.

The diagram shows the burette readings in one titration.

Two vertical segments of a burette demonstrating liquid level measurements. The 'before' diagram has major markings at 4 and 5, with ten subdivisions of 0.1 between them. The meniscus of the liquid is positioned halfway between the 4.2 and 4.3 marks. The 'after' diagram has major markings at 28 and 29, with subdivisions of 0.1, and the meniscus is exactly on the 28.7 line.

Use these readings to complete the table, giving all values to the nearest 0.05 cm30.05\text{ cm}^30.05 cm3.

ObservationVolume (cm3\text{cm}^3cm3)
burette reading after adding solution
burette reading before adding solution
volume of solution added
[3]
c.

The student plans a different experiment to obtain a pure, dry sample of the insoluble salt, silver chloride, from dilute hydrochloric acid.

Describe the steps she should take in her experiment.

[4]

Acids, bases and salt preparations Questions

  1. IGCSE
  2. /Chemistry
  3. /Acids, bases and salt preparations