Which of the following statements is true about the pH of a neutral solution at 25°C?
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A.
The pH is greater than 7.
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B.
The pH is not equal to 7.
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C.
The pH is less than 7.
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D.
The pH is equal to 7.
Correct Answer:
D. The pH is equal to 7.
Explanation:
The correct answer is Option D: The pH is equal to 7.
At a temperature of 25°C, a neutral solution is defined by having an equal concentration of hydrogen ions and hydroxide ions. Based on the self-ionization constant of water at this specific temperature, the concentration of these ions results in a pH value of exactly 7. Solutions with a pH lower than 7 are classified as acidic, while those with a pH higher than 7 are considered basic. Therefore, for a solution to be chemically neutral at standard room temperature, its pH must be 7.
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