Answer

electrolyte

Explanation

A substance whose water solution is a good conductor of electricity is an electrolyte. Electrolytes are substances that dissociate into ions in water, and these ions are responsible for conducting electricity. The ions move freely in the solution, allowing the solution to conduct an electric current. Electrolytes can be strong or weak, depending on the degree to which they dissociate into ions. Strong electrolytes, such as sodium chloride (NaCl), dissociate completely into ions in water, while weak electrolytes, such as acetic acid (CH3COOH), only partially dissociate. The presence of these ions in the solution makes it a good conductor of electricity.