Question

Part A Calculate the concentration of an aqueous solution of Ca(OH)2 that has a pH of...

Part A

Calculate the concentration of an aqueous solution of Ca(OH)2 that has a pH of 11.43.

Express your answer using two significant figures.
[Ca(OH)2] =
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Homework Answers

Answer #1

Answer – We are given, pH = 11.43

We know ,

pH + pOH = 14

so, pOH = 14- pH

               = 14 – 11.43

               = 2.57

We know

[OH-] = 10-pOH

          = 10-2.57

        = 0.00269 M

We know

[Ca(OH)2] = 2*[OH-]

So. [Ca(OH)2] = 0.00269 M / 2

                       = 0.0013 M

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