Each of the following aqueous solutions was tested using the conductivity apparatus shown below. Predict whether the light bulbs in each would result in bright, dim, or dark.

(a) 0.25 M sucrose
(b) 0.25 M phosphoric acid
(c) 0.25 M potassium nitrate

• A. (a) dim; (b) bright; (c) dark
• B. (a) bright; (b) dim; (c) dark
• C. (a) dark; (b) dim; (c) bright
• D. (a) bright; (b) dark; (c) dim
• E. (a) dark; (b) bright; (c) dim

Answer: (C)