Question

Which of the following solutions will have the highest concentration of chloride ions? Which of the following solutions will have the highest concentration of chloride ions? 0.10 M MgCl2 0.10 M AlCl3 0.05 M CaCl2 0.10 M LiCl All of these solutions have the same concentration of chloride ions.

Answer 1

Answer:

0.10 M AlCl₃.

Explanation:

We can calculate the concentration of chloride ion [Cl⁻] in each salt:

• 0.10 M MgCl₂:

MgCl₂ is dissociated according to the reaction:

MgCl₂ → Mg²⁺ + 2Cl⁻,

Every 1 mol of MgCl₂ produces 2 mol of Cl⁻.

So, [Cl⁻] = (2)*(0.1 M) = 0.2 M.

• 0.10 M AlCl₃:

AlCl₃ is dissociated according to the reaction:

AlCl₃ → Al³⁺ + 3Cl⁻,

Every 1 mol of AlCl₃ produces 3 mol of Cl⁻.

So, [Cl⁻] = (3)*(0.1 M) = 0.3 M.

• 0.05 M CaCl₂:

CaCl₂ is dissociated according to the reaction:

CaCl₂ → Ca²⁺ + 2Cl⁻,

Every 1 mol of CaCl₂ produces 2 mol of Cl⁻.

So, [Cl⁻] = (2)*(0.05 M) = 0.1 M.

• 0.10 M LiCl:

LiCl is dissociated according to the reaction:

LiCl → Li⁺ + Cl⁻,

Every 1 mol of LiCl produces 1 mol of Cl⁻.

So, [Cl⁻] = (1)*(0.1 M) = 0.1 M.

So, the solution will have the highest concentration of chloride ions is AlCl₃.