Multiple Choice
In an aqueous solution, what makes a substance acidic according to the Arrhenius definition?
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17. Acid and Base Equilibrium
Acids Introduction
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Which of the following is a characteristic property of an acid in aqueous solution?
A
It acts only as an electron-pair donor (Lewis base).
B
It increases the concentration of in water.
C
It increases the concentration of in water.
D
It always has a pH equal to .
Verified step by step guidance1
Understand the definition of an acid according to the Arrhenius theory: an acid increases the concentration of hydrogen ions (H\+ ) in aqueous solution.
Recognize that the Lewis acid-base theory defines acids as electron-pair acceptors, not donors; therefore, the statement about acting only as an electron-pair donor is incorrect for acids.
Recall that bases increase the concentration of hydroxide ions (OH\-) in water, so the statement about increasing OH\- concentration describes a base, not an acid.
Know that a neutral solution has a pH of 7, but acids have pH values less than 7, so the statement about always having pH equal to 7 is false for acids.
Conclude that the characteristic property of an acid in aqueous solution is that it increases the concentration of H\+ ions.
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