Ncert Exercises & Solutions

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?

Explanation for the given statement on the basis of ionisation and effect upon the concentration of sodium chloride is given below

(i) Sugar being a non-electrolyte does not ionise in water whereas NaCl ionises completely in water and produces Na⁺ and Cl^- ion which help in the conduction of electricity.

(ii) When concentration of NaCl is increased, more Na⁺ and Cl^- ions will be produced. Hence, conductance or conductivity of the solution increases.

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