What Is the Hydroxide Ion Concentration in an Aqueous Solution $10 ^ { - 9 }$

Multiple Choice

What is the hydroxide ion concentration in an aqueous solution where the pH = 5?

A) The hydronium ion concentration equals 1 × $10 ^ { - 9 }$ .
B) The hydronium ion concentration equals 1 × $10 ^ { - 7 }$ .
C) The hydronium ion concentration equals 1 × $10 ^ { - 5 }$ .
D) The hydronium ion concentration equals 1 × $10 ^ { - 3 }$