Rates of reaction: continuous monitoring method A Level Chemistry
The continuous monitoring method requires students to track a reaction's progress over time by repeatedly measuring a specific variable, such as gas volume, mass, or color change, to determine the rate of reaction.
Subject: Chemistry | Level: A Level |
You will need:
Method
Measure 50ml of 0.8M Hydrochloric Acid into a conical flask.
If using the gas syringe method set the equipment up as below:
If using the trough and measuring cylinder set the equipment up as shown below:
Add a 6cm piece of Magnesium Ribbon to the conical flask and immediately place the bung in the top of the conical flask and start the stopclock.
Record the volume of gas that is produced every 15 seconds, and continue this for a period of 2 and half minutes.
Make sure to record your results in a suitable table.
Repeat these steps using a lower concentration (0.4M) Hydrochloric Acid.
Use your results to plot a graph of the volume of Hydrogen produced on the y-axis against time (s). Do this for both concentrations of Hydrochloric Acid.
Draw a line of best fit on the graph
Draw a tangent to each line of best fit at time t=0
Calculate the gradient of each tangent to calculate the rate of reaction:
Gradient = Change in y / Change in xCompare the values for both reactions.
