Why fused Calcium chloride and concentrated sulphuric acid is used in a desiccator?

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Solution

Fused calcium chloride also known as anhydrous calcium chloride is an hygroscopic compound. This means that it has the ability to absorb water from compounds and mixtures that surround it.

This hygroscopic nature of anhydrous calcium chloride allows it to be used as desiccant and not potassium chloride. Desiccants are compounds that are used in desiccators to dry other compounds or substances.

Other commonly used desiccants apart from anhydrous calcium chloride are calcium sulphate and activated charcoal.

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Similar questions

In the preparation of hydrogen chloride from sodium chloride and sulphuric acid, the sulphuric acid used should be concentrated

(a) Write the equation for:
(i) the preparation of hydrogen chloride from sodium chloride and sulphuric acid. State whether the sulphuric acid should be concentrated or dilute.
(ii) the preparation of ammonia from ammonium chloride and calcium hydroxide.
(iii) the reaction of hydrogen chloride with ammonia.

Give reasons for the following :

(a) Sodium hydrogen sulphate is not an acid but it dissolves in water to give hydrogen ions, according to the equation

$N a H S O_{4} ⇌ H^{+} + N a^{+} S O_{4}^{2 -}$

(b) Anhydrous calcium chloride is used in a desiccator.

Q. (a) Why is high temperature avoided in the preparation of hydrogen chloride from sodium sulphate and concentrated sulphuric acid?
(b) Sodium chloride is preferred for the preparation of HCI. Why? [2 MARKS]

(a) What is the property of concentrated sulphuric acid which allows it to be used in the preparation of hydrogen chloride and nitric acid?
(b) What property of hydrogen chloride is demonstrated when it is collected by downward delivery (upward displacement)?
(c) Why is hydrogen chloride not collected over water?

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