Скачать или смотреть EXP:1|MINOR PRACTICAL|Separation of Naphthalene from Sand&Salt by Sublimation|GRADE:10|PBA|CHEMISTRY

Description – Experiment 1: Separation of Naphthalene from Sand and Salt by Sublimation

This experiment is performed to separate naphthalene from a mixture of sand and salt by using the physical process of sublimation. Sublimation is the change in which a solid directly converts into vapour on heating and the vapour changes back into solid on cooling without passing through the liquid state.

In this experiment, naphthalene is a sublimable substance, while sand and salt are non-sublimable substances. When the mixture is heated gently in a china dish placed on a sand bath, naphthalene changes into vapours. These vapours rise upward and when they touch the cool surface of the inverted funnel with moist filter paper, they condense and form pure crystals of naphthalene.

Sand and salt remain in the china dish because they do not sublime. In this way, naphthalene is separated from the mixture by sublimation. This experiment shows that sublimation is an effective physical method for separating a sublimable solid from non-sublimable impurities.

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