Absolute alcohol (100% alcohol) is prepared by 6 distilling...

Absolute alcohol (100\% alcohol) is prepared by 6 distilling rectified spirit over
(a) $\mathrm{Mg}\left(\mathrm{OC}_{2} \mathrm{H}_{5}\right)_{2}$
(b) $\mathrm{CaCl}_{2}$
(c) $\mathrm{Na}$
(d) $\mathrm{Mg}$

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Key Concepts

Drying Agents

Drying agents are substances that absorb water from mixtures without dissolving in them. In organic chemistry, they are used to remove traces of water from solvents or reagents to create an anhydrous environment, which is crucial for reactions that are sensitive to moisture. Their selectivity ensures that they bind water rather than react with the target compound.

Dehydration Process

The dehydration process involves the removal of water from a substance to achieve a dry or anhydrous state. This is particularly important in the preparation of absolute solvents, such as alcohol, where the presence of water can interfere with chemical reactions or properties. Dehydration is often carried out by employing drying agents during distillation or by using other methods to eliminate water content from the mixture.

Distillation Techniques

Distillation is a separation technique based on differences in boiling points of components in a mixture. It is used not only to purify liquids by sequentially vaporizing and condensing them but also to concentrate specific components. In the context of producing anhydrous substances, repeated or fractional distillation may be combined with drying agents to remove water effectively and obtain a high-purity product.

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