Question

A mixture of KCl and KF is added to sodium chloride
(a) to increase the conductivity of NaCl
(b) to decrease the melting point of NaCl
(c) to supress the melting of dissociation of NaCl
(d) to decrease the volatility of NaCl

Answer 1

(a) to increase the conductivity of NaCl.

Answer 2

Answer:

Concept:

The chemical compound potassium fluoride has the formula KF. Following hydrogen fluoride, KF is the most common source of the fluoride ion in manufacturing and chemistry. Carobbiite is an alkali halide that occurs naturally as an uncommon mineral. Although HF is more effective, KF solutions will etch glass due to the production of soluble fluorosilicates. The metal halide salt potassium chloride (KCl, or potassium salt) is made up of potassium and chlorine. It has a white or colourless vitreous crystal look and is odourless. The material dissolves easily in water and has a salty taste to its solutions. Potassium chloride can be found in dried lake sediments dating back thousands of years.

Given:

A mixture of KCl and KF is added to sodium chloride

(a) to increase the conductivity of NaCl

(b) to decrease the melting point of NaCl

(c) to supress the melting of dissociation of NaCl

(d) to decrease the volatility of NaCl

Find:

find the correct option for the given question

Answer:

The answer is option (b) to decrease the melting point of NaCl

Because it is covalent rather than ionic, it has a lower melting point than NaCl. Characteristics of Alkali Metal Oxides and Hydroxides

=> The melting point of sodium chloride is 1074K. In the molten state, sodium chloride can be electrolyzed to obtain sodium. The addition of KCl and even KF lowers the melting point of the mixture. This is included in order to obtain sodium at a low temperature.

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