Q4.13P - Chemistry: Molecular Nature Of Matter And Change

Question

Question: State whether an aqueous solution of each of the following substances conducts an electric current. Explain your reasoning. 

(a) Potassium sulfate (b) Sucrose, ${\mathit{C}}_{\mathbf{12}}{\mathit{H}}_{\mathbf{22}}{\mathit{O}}_{\mathbf{11}}$

 

Step-by-Step Solution

Answer

Answer

 

a) Yes, an aqueous solution of Potassium sulfate conducts an electric current.

b) No, an aqueous solution of Sucrose,${\mathit{C}}_{\mathbf{12}}{\mathit{H}}_{\mathbf{22}}{\mathit{O}}_{\mathbf{11}}$  does not conduct an electric current.

Step 1: Explain the solubility of ionic compounds in aqueous solution

 

Those compounds which give ions on dissolving in water can conduct electric current in their aqueous solution.

Step 2: Determine aqueous solution of given compounds conduct electricity or not

 

In the case of Potassium sulfate: It is an ionic compound and dissociates into its ions as K⁺ and SO₄ ^2-  through which their aqueous solution conducts electric current.

In the case of Sucrose,${\mathit{C}}_{\mathbf{12}}{\mathit{H}}_{\mathbf{22}}{\mathit{O}}_{\mathbf{11}}$ It is a covalent compound and does not dissociate into ions even though it is soluble in water.

Hence, it is known as non-electrolyte and its aqueous solution does not conduct an electric current.