Experimental Design Version 1 dated 3 Jan 2001

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Experimental DesignVersion 1 dated 3 Jan 2001
by Mr Victor Lee 3 Jan 2001
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Experimental design
a. name appropriate apparatus for the
measurement of time, temperature, mass and
volume, including burettes, pipettes, measuring
cylinders and gas syringes b. suggest suitable
apparatus, given relevant information, for a
variety of simple experiments, including
collection of gases and measurement of rates of
reaction
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How to use

• a. a stopwatch to measure time
• a burette, a pipette and a measuring cylinder to
  measure liquid volume
• c. a thermometer to measure temperature
• d. a beam balance or an electronic balance to
  measure mass
• e. a gas syringe to collect a gas and measure
  its volume

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Measurement of Time
1. What is the SI Unit for time? 2. What is
the accuracy of the 2 watches above?
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Measurement of Temperature

• What is the SI Unit for temperature?
• How is Kelvin Scale related to Celsius Scale?
• 3. What is the accuracy of the thermometer above?
• What is the usual range of the mercury
  thermometer?
• What are some more accurate instruments?

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Measurement of Mass

• What is the SI Unit for mass?
• What is the other instrument that has higher
  accuracy?
• What is the accuracy of the suggested instrument
  in (2)?

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Measurement of Liquid Volume 1/4
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Measurement of Liquid Volume 2/4
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Measurement of Liquid Volume 3/4

• 1. What is the SI Unit for volume?
• What is the accuracy of a measuring cylinder?
• 3. What is the accuracy of a pipette?
• 4. What is the accuracy of a burette?

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Measurement of Liquid Volume 4/4

• By positioning your eyes at the level as shown,
  what error are you trying to avoid?
• What other possible precautions you must take
  when taking such measurement?

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Measurement of Gaseous Volume

• What precautions you must take when collecting
  gas
• as shown above?
• 2. What are some advantages of using the above
  setup?

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Collection of Gases

• What are the 2 main considerations when you
  consider
• which method to deploy for collection of gases?

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Collection of Dry Gases 1/4
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Collection of Dry Gases 2/4
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Collection of Dry Gases 3/4
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Collection of Dry Gases 4/4

• What are the considerations when you are
  considering which drying agents to be used?
• Can we use Concentrated Sulphuric Acid to dry
  Ammonia Gas? Why?
• Can we use Quicklime (Calcium Oxide) to dry
  hydrogen chloride or sulphur dioxide gas? Why?
• Can we use Concentrated Sulphuric Acid to dry
  Oxygen Gas? Why?