How does a solution’s composition affect its electrical conductivity?

Question

i need help with a cer about this 

Answer 1

The number of ions that are free in solution will determine its electrical conductivity.  Thus, only electrolytes dissolved in solution will conduct a current.  Non electrolytes will not.

Examples:

1 M glucose = non electrolyte = will not conduct.

1M NaCl = an electrolyte = 1 M Na⁺ ions and 1 M Cl^- ions.  Will conduct.

1M MgCl₂ = an electrolyte = 1 M Mg²⁺ ions + 2M Cl^- ions.  Will conduct better than 1 M NaCl (more ions).