Everything Science Grade 11

(Marvins-Underground-K-12) #1

8.1 CHAPTER 8. TYPES OFREACTIONS


Acid-carbonate reactions ESBBZ


Activity: The reaction of acids with carbonates


Apparatus and materials:

Small amounts of sodium carbonate powder and calcium carbonate powder; hydrochloric
acid and sulphuric acid; retort stand; two test tubes; two rubber stoppers for the test tubes; a
delivery tube; lime water. The demonstration should be set up as shownbelow.

sodium carbonate & hy-
drochloric acid

limewater

delivery tube

rubber stopper

rubber stopper

Method:


  1. Pour limewater into one of the test tubes andseal with a rubber stopper.

  2. Carefully pour a small amount of hydrochloric acid into the other test tube.

  3. Add a small amount of sodium carbonate to the acid and seal the test tube with the rubber
    stopper.

  4. Connect the two testtubes with a delivery tube.

  5. Observe what happens to the colour of the limewater.

  6. Repeat the above steps, this time using sulphuric acid and calcium carbonate.


Observations:

The clear lime water turns milky meaning that carbon dioxide has beenproduced.

When an acid reacts with a carbonate a salt, carbon dioxide and water are formed. Look at the follow-
ing examples:

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