Pure water and sodium chloride crystals are both poor conductors of electricity by themselves. However, if sodium chloride crystals are dissolved in pure water, the solution becomes a good conductor of electricity.

Question

How does this phenomenon demonstrate the theory of ionic bonding?

A. It shows that the attractive forces between ions are not as strong as those between water molecules.
B. It shows that water molecules are necessary for bonding to occur between positive and negative ions.
C. It shows that atoms with similar electronegativity values will share electrons equally in chemical bonds.
D. It shows that the bonds in sodium chloride crystals are made up of charged ions rather than neutral atoms.

it is B?

Answer 1

No, not B. Solid NaCl crystals have positive Na ions and negative Cl ions locked into the crystal structure; however, since they are locked into position they can not move. Since the ions cannot move the solid cannot conduct electricity. When the NaCl crystal is place in water, however, it dissolves which allows the Na ions and the Cl ions to move around. In solution, then, NaCl is a good conductor of electricity. If you distill all of this information the correct answer should become obvious.

Answer 2

The solution of water and salt are good conductor of electricity because the process of dissolving makes the electrons in their atoms free to move.

The correct option is A.

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