Question

If the pH of a solution is 10.18, what is its pOH?


Select one:
A. 7.63
B. 10.18
C. 3.82
D. 9.34

Answer 1

PH + POH =14

10.18+POH=14

POH=14-10.18

POH =3.82

OPTION (C) IS CORRECT.

Answer 2

Basic Concept -

• The pH of a solution grades an aqueous solution from 0 to 14 depending on the concentration of H+ ions.

• The pH of a solution is given by -log₁₀[H+]

      Where,

     => [H+] is the molar concentration of H+ ions in the solution in  

         moles/litre

• The pOH of a solution grades an aqueous solution from 0 to 14 depending on the concentration of OH⁻ ions.

• The pOH of a solution is -log₁₀[OH⁻ ]

      Where,

     =>  [OH⁻ ] is the molar concentration of OH⁻ ions in the solution in  

           moles/litre .

• The sum of pH and pOH values for a solution is always equal to 14.

Thus -

$pH + pOH = 14$

=> 10.18 + pOH = 14

=> pOH = 14-10.18

=> pOH = 3.82

Answer -

=> The pOH of a solution with pH 10.18 is 3.82

More to know -

=> The higher the solution is graded on the pH scale, the more alkaline it is, the lower the solution is graded on the pH scale the more acidic it is.

=> The higher the solution is graded on the pOH scale, the more acidic it is, the lower the solution is graded on the pOH scale, the more alkaline it is.