August 2018 NY Regents Chemistry Exam
48 Which solution is the best conductor of an electric current?
(1) 0.001 mole of NaCl dissolved in 1000. mL of water
(2) 0.005 mole of NaCl dissolved in 1000. mL of water
(3) 0.1 mole of NaCl dissolved in 1000. mL of water
(4) 0.05 mole of NaCl dissolved in 1000. mL of water
Solution: Solution that has the highest concentration of NaCl dissolved will be the best conductor of electricity. Electricity is the movement of charges. The more NaCl is dissolved in water, the more charges will be produced (Na+ and Cl- ions) and the better electric current will be conducted.
Answer: 3
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