Question

Calculate the OH-ion concentration of a 6.2x10-3 M HCIO3 solution.

Answer 1

1.62x10⁻¹² M

Step-by-step explanation:

HClO₃ is a strong acid, meaning that a 6.2x10⁻³ M solution has a molar concentration of H⁺ of 6.2x10⁻³.

With the above information in mind, we can calculate the pH of the solution:

• pH = -log(6.2x10⁻³) = 2.21

Now we can calculate the pOH of the solution, using the pH:

• pOH = 14 - pH

• pOH = 11.79

Finally we calculate [OH⁻], using the definition of pOH:

• pOH = -log[OH⁻]

• [OH⁻] =
  `10^(-pOH)` = 1.62x10⁻¹² M