Answer:
2.5 mol·L⁻¹
Explanation:
Ca(OH)₂(aq) ⟶ Ca²⁺(aq) + 2OH⁻(aq)
I/mol·L⁻¹ : 2.5 0 0
C/mol·L⁻¹: -2.5 +2.5 +5.0
F/mol·L⁻¹: 0 2.5 5.0
Ca(OH)₂ is a strong electrolyte. It dissociates completely in solution to form ions
Initial
Assume you dissolve 2.5 mol of Ca(OH)₂ in enough water to make 1 L of solution.
In the instant before it dissociates, you have a 2.5 mol·L⁻¹ solution of Ca(OH)₂ and no Ca²⁺ ions.
Change
The Ca(OH)₂ is dissociates completely into ions. You lose 2.5 mol of Ca(OH)₂ and form 2.5 mol of Ca²⁺.
Final
You end up with no formula units of Ca(OH)₂ and 2.5 mol of Ca²⁺.
