Multiple Choice
In a solution whose [H⁺] = 1.9 x 10⁻⁵ M at 25°C, what is the [OH⁻]? Is this solution acidic, basic, or neutral?
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17. Acid and Base Equilibrium
The pH Scale
Struggling with General Chemistry?
Join thousands of students who trust us to help them ace their exams!Watch the first videoMultiple Choice
What is the pH of a neutral solution at 25°C?
A
14
B
1
C
0
D
7
Verified step by step guidance1
Understand that pH is a measure of the hydrogen ion concentration in a solution, defined as \( \text{pH} = -\log[\text{H}^+] \).
Recognize that a neutral solution at 25°C has equal concentrations of hydrogen ions \( [\text{H}^+] \) and hydroxide ions \( [\text{OH}^-] \).
Recall that in pure water at 25°C, the concentration of hydrogen ions \( [\text{H}^+] \) is \( 1 \times 10^{-7} \) M.
Apply the pH formula: \( \text{pH} = -\log(1 \times 10^{-7}) \).
Calculate the pH value, which is 7, indicating a neutral solution at 25°C.
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