Answer: 5.18
Explanation:
Mathematically, pOH is expressed as
pH = -log(OH-)
where OH-is the concentration of hydroxide ion
So, pOH calculations are as follows
pOH = -log(1.50x10-9 M)
pOH = -(-8.82)
pOH = 8.82 [the two minus signs cancelled out]
Since pOH = 8.82; apply the formula
pH + pOH = 14 to get pH of the solution
Hence, pH + pOH = 14
pH + 8.82 = 14
pH = 14 - 8.82
pH = 5.18
Thus, the pH of a solution with a 1.50x10-9 M hydroxide ion concentration is 5.18 (slightly acidic)
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