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?
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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