What is the pH of a solution with a 1.50x10-9 M hydroxide ion concentration?

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)