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Question
The aqueous solution of sugar does not conduct electricity. However, when sodium chloride is added to water, it conducts electricity. How will you explain this statement on the basis of ionisation and how is it affected by concentration of sodium chloride?
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Solution
(i) Sugar being a non-electrolyte does not ionize in water, whereas \[\ce{NaCl}\] ionizes completely in water and produces \[\ce{Na+}\] and \[\ce{Cl-}\] ions which help in the conduction of electricity.
(ii) When concentration of \[\ce{NaCl}\] is increased, more \[\ce{Na+}\] and \[\ce{Cl}\] ions will be produced. Hence, conductance increases.
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