RP7-B-Measuring the rate of a reaction by a continuous monitoring method (Mg + HCL gas collection)

Question 1

describe the method used?

Answer 1

1. Add 50 cm3 of 0.8 moldm-3 hydrochloric acid to a conical flask.
2. Set up the gas syringe or alternative gas collection equipment.
3. Add a 6 cm strip of magnesium ribbon to the conical flask, place the bung firmly into the top of the flask and start the timer. Swirl the flask every few seconds.
4. Record the volume of hydrogen gas collected in the gas syringe every 15 seconds for 2.5 minutes.
5. Alter the concentration of HCl and repeat steps (1) to (4).

Question 2

Draw a diagram to show the set up for this experiment.

Question 3

What are some considerations that we may need to take?

Answer 3

• A typical gas syringe only measures 100 cm3 of gas so you don’t want a reaction to produce more than this volume. Quantities of reactants need to be calculated carefully.

Question 4

FINISHED