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33. TO SHOW THE PRESENCE OF OXYGEN IN AIR AND TO DETERMINE ITS PERCENTAGE BY VOLUME.
THEORY: Burning is one of the most familiar examples of chemical changes.…
32. TO SHOW THE PRESENCE OF CARBON DIOXIDE IN AIR.
THEORY: The presence of carbon dioxide in air can be shown by…
31. TO SHOW THE PRESENCE OF WATER VAPOUR IN AIR.
METHOD 1 THEORY: The presence of moisture or water vapour in air…
30. TO SEPARATE THE COMPONENTS OF A MIXTURE OF TWO INSOLUBLE SOLIDS. (ONE BEING SOLUBLE IN DIL ACID)
THEORY: Suppose the given mixture contains calcium carbonate and sand. Both are…
29. TO MIX THE TWO GIVEN SOLUTIONS, AND TO SEPARATE THE PRECIPITATE IN PURE AND DRY STATE
THEORY: Precipitation is a double decomposition reaction (also called metathesis) usually between…
28. TO SEPARATE A MIXTURE OF TWO SOLUBLE SOLIDS [SAY KNO3+ CU(NO3)2] BY FRACTIONAL CRYSTALLIZATION.
THEORY: Fractional crystallization is a fairly successful method of separating the components…
27. TO PREPARE A SATURATED SOLUTION OF AN IMPURE SALT, AND TO OBTAIN THE PURE CRYSTALS OF THE SAME AFTER CRYSTALLIZATION.
THEORY: Crystals are homogenous particles having regular and definite geometric shapes. When…
26. TO SEPARATE THE COMPONENTS OF THE MIXTURE OF TWO IMMISCIBLE LIQUIDS.
(A) OIL-WATER MIXTURE (B) CHLOROFORM-WATER MIXTURE THEORY: Immiscible liquid-liquid mixtures like oil…
25. TO DETECT THE PRESENCE OF DISSOLVED SOLIDS IN THE GIVEN AQUEOUS SOLUTION, AND TO RECOVER THE SOLVENT FROM THE SOLUTION.
THEORY: Distillation is the process of converting a liquid into its vapour…