Name the separation technique for the following :- (a) Mercury and water (b) mixture of alcohol and water (c) gases from liquified air (d) pure copper sulphate from impure solution (e) different pigments from extract of flower petals (f) metal pieces from engine oil of a car .
Answers
Answer:
(a) Mercury and water are separated by decantation by using separating funnel as the separation of two immiscible liquid by separating funnel depends on the difference on the densities.mercury is heavier than water therefore , form the lower layer and separated from water.
(b) Fractional distillation is a method for separating a liquid from the mixture of two or more liquid .this method works because the liquid of mixture have different boiling points.
(c)- pure gases can be separated from air by first cooling it until became liquefies, then selectively distilling the components at the various boiling temperature.The process can produce high purity gases but it energy- intensive .
(d)-Take some( approximately 5 kg) impure sample of copper sulphatein a China dish.disolve it in minimum amount of water filter the impurities out.evaporate water from the copper sulphate solution so as to gat a saturated solution.
(d)-The pigment of extract of flower Patel can be separated out by the process of chromatography is a technique of separation of the substance which is very close in their molecular weight but differ in the molecular sizes.
(e)-small pieces of metal in the engine oil of car- vaccum filtration. this is because vaccum filtration is performed under pressure ,so it will be able to separate the dense oil of the metal pieces.