A NaOH solution has an OH– concentration of 1×10-5M. What is the pH of the solution?
A. 2
B. 5
C. 9
D. 12
Click for Explanation
Two relationships are necessary for this solution:
pOH = -log[OH–] and pOH + pH = 14
pOH = -log[1×10-5] = 5, and 14 – 5 = 9.
A. 2, incorrect, This results from subtracting the pOH from 7.
B. 5, incorrect, This is the pOH.
C. 9, correct.
D. 12, incorrect, This results from adding the pOH to 7.
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