Solutions and cognitive properties

Question

What is the molarity of ions in a .342 M solution of Ca(OH)2 assuming the compound dissociates completely?

Answer 1

Molarity (M) means moles of solute per liter of solution.

In the current problem, we have 0.342 moles of Ca(OH)₂ per liter of solution, i.e. 0.342 M Ca(OH)₂.

Assuming complete dissociation/ionization, that would be 0.342 M Ca²⁺ and 2x0.342 = 0.684 M OH^- ions.

This is because you get 2 moles of OH- for every 1 mol of Ca2+

Ca(OH)₂ ==> Ca²⁺ + 2OH^-