7. When sodium chloride dissolves in water, how do the water molecules orient ar

Question

7. When sodium chloride dissolves in water, how do the water molecules orient around the ions? a. The oxygen atoms point toward both the sodium and the chloride. b. Around sodium the oxygen atoms point toward the sodium, and around chloride the hydrogen atoms point toward the chloride. c. The hydrogen atoms point toward both the sodium and the chloride. Around sodium the hydrogen atoms point toward the sodium, and around chloride the oxygen atoms point toward the chloride. e. Water molecules are randomly oriented around the ions.

Explanation / Answer

11.Option d) is incorrect that is the vapor pressure is the pressure of the gas at a given temperature in equilibrium with its liquid phase.

The statement should be "the vapor pressure is the pressure of the vapor at a given temperature in equilibrium with its liquid phase."

Vapor is different from gas,

Usually gas term is used for a substance which does not exist as liquid under normal pressure(1 atm) and at room temperature.

example hydrogen gas, nitrogen gas etc.

Remaining all the statements are correct.

7. Water is a polar liquid.Due to this nature it can dissolve many ionic substances in it.

NaCl(aq) ---------> Na+(aq) + Cl-(aq)

water also exists as negative and positive parts. Highly electronegative O-atom has partial negative charge on it. Hydrogen atoms have partial positive charge due to less electronegative than oxygen atom.

H2O -----------> H+ + OH-

Hence around sodium ions oxygen atoms of OH- ions and around chloride ions H+ ions will allign themselves.

Since opposite poles attract each other.

Hence option b) is correct.

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