4 Researching Chemistry

Question 1

Methods for collection of gases

Answer 1

• collection over water (for relatively insoluble gases or where a dry sample of gas is not required)
• collection using a gas syringe (for soluble gases or where a dry sample of gas is required)

Question 2

Volumetric analysis general practice

Answer 2

• volume markings on beakers provide only a rough indication of volume
• measuring cylinders generally provided sufficient accuracy for preparation work, but for analytic work, burettes, pipettes and volumetric flasks are more appropriate

Question 3

Separating a mixture of liquids with different boiling points

Answer 3

Simple distillation using a flask, condenser and suitable heat source