객관식
What is the pH of an aqueous solution with the hydronium ion concentration [H3O+] = 2 x 10^-14 M?
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3. Water
pH Scale
Multiple Choice
In a neutral solution, the concentration of __________.
A
Hydrogen ions is less than the concentration of hydroxide ions.
B
Water molecules is less than the concentration of hydroxide ions.
C
Hydrogen ions is greater than the concentration of hydroxide ions.
D
Hydrogen ions is equal to the concentration of hydroxide ions.
검증된 단계별 안내1
Understand the concept of a neutral solution: A neutral solution is one where the pH is 7, indicating that the solution is neither acidic nor basic.
Recall the definition of pH: pH is a measure of the hydrogen ion concentration in a solution. A pH of 7 means that the solution has equal concentrations of hydrogen ions (H⁺) and hydroxide ions (OH⁻).
Apply the concept of water dissociation: In pure water, a small number of water molecules dissociate into hydrogen ions (H⁺) and hydroxide ions (OH⁻). The equation for this dissociation is:
Recognize the equilibrium condition: In a neutral solution, the concentrations of H⁺ and OH⁻ are equal because the dissociation of water is at equilibrium. This is represented by the equation: [H⁺] = [OH⁻].
Conclude with the correct statement: In a neutral solution, the concentration of hydrogen ions is equal to the concentration of hydroxide ions, which is why the solution is neither acidic nor basic.
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