Multiple Choice
Which of the following statements is true regarding the pH of strong bases KOH and Ca(OH)2 given their respective pH values of 11.89 and 11.68?
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17. Acid and Base Equilibrium
pH of Strong Acids and Bases
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What is the pH of a solution with [OH-] = 1 × 10^-12 M?
A
12
B
14
C
7
D
2
Verified step by step guidance1
Start by understanding the relationship between pH, pOH, and the concentration of hydroxide ions [OH⁻]. The pOH is calculated using the formula: \( \text{pOH} = -\log[\text{OH}^-] \).
Substitute the given concentration of hydroxide ions into the formula: \( \text{pOH} = -\log(1 \times 10^{-12}) \).
Calculate the pOH. Since \( \log(1 \times 10^{-12}) = -12 \), the pOH is 12.
Use the relationship between pH and pOH, which is given by the equation: \( \text{pH} + \text{pOH} = 14 \).
Substitute the calculated pOH into the equation to find the pH: \( \text{pH} = 14 - 12 \).
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