Aim : To prove that the presence of air and water are essential for corrosion.
Materials required : 3 test tubes,3 iron nails,oil, water, anhydrous calcium chloride, rubber corks.
Procedure :
(1) Take three test tubes and place clean iron nails in each of them. Label the test tubes A, B and C.
(2) Pour some water in test tube A and cork it.
(3) Pour boiled distilled water in test tube B, add about 1 ml of oil and cork it.
(4) Put some anhydrous calcium chloride in test tube C and cork it.
(5) Leave these test tubes for few days and then observe.
(6) After few days, we will observe that iron nails rust in test tube A, but they do not rust in test tubes B and C.
