Which of the following best explains why electrolytes are able to conduct electricity in aqueous solution?

• A. They form covalent bonds with water molecules, increasing conductivity.
• B. They precipitate out of solution, leaving behind free electrons.
• C. They increase the temperature of the solution, allowing electrons to flow.
• D. They dissociate into ions that can move freely and carry charge.

Answer: (D)

Verified step by step guidance

1. Understand that electrolytes are substances that, when dissolved in water, produce ions.
2. Recognize that electrical conductivity in aqueous solutions depends on the presence of charged particles (ions) that can move freely.
3. Recall that electrolytes dissociate into positive and negative ions in water, which are responsible for carrying electric current.
4. Note that covalent bonding with water or precipitation does not produce free ions and thus does not enhance conductivity.
5. Conclude that the ability of electrolytes to conduct electricity is due to their dissociation into ions that move freely and carry charge through the solution.