Prac 7

Question 1

Required Practical 7a Measuring Initial Rate

Answer 1

• Measure 50 cm³ of the 1.0 mol dm⁻³ hydrochloric acid and add to conical flask.
• Setup the gas syringe in the stand.
• Weigh 0.20 g of magnesium.
• Add the magnesium ribbon to the conical flask, place the bung firmly into the top of the flask, and start the stopwatch.
• Record the volume of hydrogen gas collected in 30 seconds.
• Repeat using different concentrations of HCl.
• Draw a graph and analyse the data.

Question 2

Measure 50 cm³ of the 0.1 M Acid. How?

Answer 2

Use a measuring cylinder to measure the volume.

Question 3

• Set up the gas syringe. How?

Answer 3

Ensure the syringe is zeroed.

Question 4

7b Measuring Continuous Rate. How?

Answer 4

A better experiment is to measure the volume of gas produced at 10-second intervals for two minutes. You can get much more data and analyse how the rate changes over time for each test.