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Solution: What is the H+ ion concentration in a 2.1 x10–4 M Ca(OH)2 solution?A) 7.3 x 10–4 MB) 1.4 x 10–3 MC) 2.1 x 10–4 MD) 2.4 x 10–11 M

Problem

What is the H+ ion concentration in a 2.1 x10–4 M Ca(OH)2 solution?

A) 7.3 x 10–4 M

B) 1.4 x 10–3 M

C) 2.1 x 10–4 M

D) 2.4 x 10–11 M

Solution

We are being asked to calculate the H+ concentration in a 2.1x10-4 M Ca(OH)2 solution.

Recall:

Any Group 1A metal when combined with OH-, H-, O2- or NH2- makes a strong base
Any Group 2A metal (from Ca2+ to Ba2+when combined with OH-, H-, O2- or NH2- makes a strong base


Ca(OH)2:

Ca (Group 2A metal) is paired with OH-
Ca(OH)2strong base


Since Ca(OH)2 is a strong base, it will completely dissociate in the solution:

Ca(OH)2(aq) → Ca2+(aq) + 2 OH-(aq)


From Ca(OH)2 we can determine the concentration of OH- but we are being asked for the concentration of H+ ion.

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