Question

Activity to know about condition for rusting
AIM:
APPARATUS :
PROCEDURE :
OBSERVATION:
INFERENCE :
PRECAUTIONS :
STEP BY STEP ANSWER

Answer 1

AIM: To study rusting APPARATUS: Iron nail,testtubes,water,cork,boiled water,calcium chloride PROCEDURE:Take three test tubes A, B and C and place one clean iron nail in each of them. In the test tube A pour some water and close its mouth with the help of a cork. In the test tube B pour boiled water which does not contain dissolved air. Also pour some oil in test tube B to form a layer over boiled water. The layer of oil will prevent the entry of air in water. In the test tube C put some anhydrous calcium chloride and cork it. Anhydrous calcium chloride is drying agent. So, it is added into test tube C to absorb all the moisture present in the air of test tube. Keep these test tubes undisturbed for some days. OBSERVATION: After some days, you will observe that the nail in test tube B does not rust because the nail was exposed only to water and no air was present in it. In the same way the nail present in test tube C does not rust because in this tube air is dry and water is not present. But the nail present in test tube A rusts because in test tube A the nail was exposed to both air and water. This shows that for rusting of iron both air and water are necessary. INFERENCE: water and air is essential for rusting PRECAUTIONS: dont touch the chemicals with naked hand if touched wash it strongly