Final answer:
Na2CO3 (sodium carbonate) will act as a strong electrolyte in solution.
Step-by-step explanation:
An electrolyte is a substance that conducts electricity when dissolved in water. In this case, the compound that will act as a strong electrolyte in solution is Na2CO3 (sodium carbonate). When sodium carbonate dissolves in water, it dissociates into Na+ and CO3²⁻ ions, which allows the solution to conduct electricity.