A water sample contains 5 mg of dissolved chloride ions per liter of solution. This concentration is equivalent to:
A0.5 ppm
B5 ppm
C50 ppm
D500 ppm
Explanation
📌 For dilute aqueous solutions (density ≈ 1 g/mL), parts per million ≈ mg per kg of solvent ≈ mg per liter. So 5 mg/L ≈ 5 ppm. Pattern: ppm = (mass of solute in g ÷ mass of solution in g) × 10⁶. Used for trace concentrations like water-quality testing (e.g., 'fluoride at 1 ppm in tap water').
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