Which substance forms a strong electrolyte solution when dissolved in water?

Which substance forms a strong electrolyte solution when dissolved in water?

• A. NaCl
• B. NH3
• C. CH3OH
• D. C6H12O6

Answer: (A)

A strong electrolyte is a substance that dissociates completely into ions when dissolved in water, providing a large number of mobile charge carriers that conduct electricity well. Sodium chloride fits this description: when it dissolves, it splits into Na+ and Cl− ions completely, giving the solution a high concentration of ions to carry charge. Ammonia in water only partially ionizes to form NH4+ and OH−, so it’s a weak electrolyte. Methanol and glucose don’t ionize at all in water, so their solutions are non-electrolytes and conduct electricity poorly. Thus, the substance that forms a strong electrolyte solution is sodium chloride.

A strong electrolyte is a substance that dissociates completely into ions when dissolved in water, providing a large number of mobile charge carriers that conduct electricity well.

Sodium chloride fits this description: when it dissolves, it splits into Na+ and Cl− ions completely, giving the solution a high concentration of ions to carry charge. Ammonia in water only partially ionizes to form NH4+ and OH−, so it’s a weak electrolyte. Methanol and glucose don’t ionize at all in water, so their solutions are non-electrolytes and conduct electricity poorly.

Thus, the substance that forms a strong electrolyte solution is sodium chloride.