A NaOH solution has an OH– concentration of 1×10-5M. What is the pH of the solution?
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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