Measuring Volume of Gas

Topic 6 - Rate and Extent of Chemical Change
Written By Atheridge Tuition

When zinc and dilute sulphuric acid react, hydrogen gas is produced.

Plan an investigation to determine how the volume of hydrogen gas generated during this reaction varies with concentration of acid.

[Required Practical - 6 marks]

Visual Mark Scheme Breakdown

    • Measuring cylinder for volume of acid

    • Scale for mass of zinc

    (1 mark)

50cm^3 of dilute sulphuric acid measured using a measuring cylinder and into a conical flask and 2g of zinc metal weighed on a scale.

    • Add zinc to acid and insert stopper with delivery tube quickly (1 mark)

    • Start stopwatch simultaneously (1 mark)

Conical flask containing sulphuric acid and zinc with a stopper and delivery tube plugged and connected to gas syringe on a stand and clamp. As stop watch is also on the side. Text reads: add zinc, insert stopper, start stopwatch simultaneously.

    • Volume of gas from gas syringe reading

    • Every 10 or 20 seconds

    (2 marks)

Volume of gas being measured using from a gas syringe by taking readings every 10 seconds as the text reads. As stopwatch is shown to indicate that.

    • Repeat with different concentrations of acid (1 mark)

Varying concentrations of acid to investigate impact on volume of gas, shown as different shades of sulphuric acid in three conical flasks. Text reads: repeat entire experiment with different concentrations of acid.

    • Volume of acid

    • Mass of zinc

    • Temperature

Control variables: volume of acid shown in a measuring cylinder, mass of zinc in a small container and temperature as a thermometer.
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