What is the molarity of Cl⁻ in a 0.220 M NaCl solution?

• A. 0.110 M
• B. 0.330 M
• C. 0.220 M
• D. 0.440 M

Answer: (C)

Verified step by step guidance

1. Understand that molarity (M) is a measure of the concentration of a solute in a solution, expressed as moles of solute per liter of solution.
2. Recognize that NaCl dissociates completely in water into Na⁺ and Cl⁻ ions. The chemical equation for this dissociation is: NaCl → Na⁺ + Cl⁻.
3. Since NaCl dissociates in a 1:1 ratio, each mole of NaCl produces one mole of Cl⁻ ions.
4. Given that the molarity of the NaCl solution is 0.220 M, this means there are 0.220 moles of NaCl per liter of solution.
5. Therefore, the molarity of Cl⁻ ions in the solution is also 0.220 M, as each mole of NaCl yields one mole of Cl⁻.