# Problem: 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

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###### FREE Expert 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.

92% (384 ratings) ###### Problem Details

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

What scientific concept do you need to know in order to solve this problem?

Our tutors have indicated that to solve this problem you will need to apply the Strong Acid-Base Calculations concept. If you need more Strong Acid-Base Calculations practice, you can also practice Strong Acid-Base Calculations practice problems.

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