reaction rate: marble & acid

D-and-C-book_113

Rates: marble and acid

Apparatus

Clamps, bosses, & stands, marble pieces (large, medium and small sizes), 1M hydrochloric acid HCl, flask, bung, delivery tube, a good gas syringe. Interface, position sensor.

Setting up

Set up the position sensor, flask, 1g of large marble pieces and the gas syringe as shown.

Connect the sensor to socket 1 on the interface. Some systems recognise the sensors you attach automatically, in others you do this yourself.

You may be able to do a two-point calibration of the sensor so that the computer displays the volume of the syringe directly.

Recording the data

3 Place 1g of marble in the flask. Add 5cm acid when you are ready. Record for 90 seconds. Repeat using different sized marble pieces.

Using the results

How does the graph show the progress of the reaction?

When was the reaction at its fastest? How can you tell?

Which part of each graph best shows how fast the reaction was working?

Calculate the average gradient of each of your graphs to compare them.

Save your data on disk. Print the graphs.

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