Question

what is the concentration of chloride ion in a 2.0 M solution of calcium chloride

Answer 1

All you have to do is multiply by two, since calcium chloride has the chem. formula, CaCl2. For every 1 mole of CaCl2, you'll have 2 mole of chloride ions in solution.

Answer 2

The concentration of chloride ion, Cl⁻ in the 2 M CaCl₂ solution is 4 M

Dissociation equation

CaCl₂(aq) --> Ca²⁺ (aq) + 2Cl⁻ (aq)

From the balanced equation above,

1 mole of CaCl₂ contains 2 moles of Cl⁻

How to determine the concentration of Cl⁻ in the solution

From the balanced equation above,

1 mole of CaCl₂ contains 2 moles of Cl⁻

Therefore,

2 M CaCl₂ will contain = 2 × 2 = 4 M Cl⁻

Thus, 4 M of chloride ion is present in the solution

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