To find the correct answer, you should know that Barium
Chloride is a strong electrolyte. A strong electrolyte will wholly complete the
circuit as shown by a brightly powered light bulb. Therefore, the correct
answer is a solid with a concentration of 0.20, where the strength of light
emitted is bright. Remember that all strong acids and highly soluble ionic
substances are strong electrolytes. Ionic compounds that are merely slightly
soluble or are insoluble may act as a poor electrolytes.
