Everything Science Grade 10

CHAPTER 14. REPRESENTING CHEMICAL CHANGE 14.2

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General experiment: The relationship between product

and reactant

Aim:To investigate the relationship between the amount of product and the amount

of reactant.

Apparatus:

• flask


• measuring cylinder


• water bowl


• delivery tube


• funnel with stopcock


• stopper


• sodium hydrogen carbonate
  (NaHCO 3 ) powder


• dilute sulphuric acid (H 2 SO 4 )

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Method:

1 Weigh 20 g of NaHCO 3 and place it into a flask.

2 Set up the above apparatus.

3 Measure out 5 ml of H 2 SO 4 and carefully pour this into the funnel (make sure

that the stopcock is closed).

4 Slowly add the H 2 SO 4 to the NaHCO 3 by opening the stopcock.

5 Observe what happens.

6 Record the volume of gas collected in the measuring cylinder.

7 Repeat the above steps but this time use 10 ml of H 2 SO 4.

8 Write a balanced equation for this reaction. (Hint: carbon dioxide gas is

formed, as well as water and sodium sulphate.)

Results and discussion: You should observe that more gas is formed when using

more H 2 SO 4.

Chemistry: Chemical change 241