What is the concentration of an AlCl₃ solution if 150.mL of the solution contains 250.mg of Cl^- ion? A) 1.57 × 10^-2 M B) 3.75 × 10^-2 M C) 4.70 × 10^-² M D) 1.41 × 10^-1 M

Question

Quizplus · Accepted Answer

To find the concentration in moles per liter (M), first convert 250 mg of Cl^- ion to grams (250 mg = 0.250 g). The molar mass of Cl^- is approximately 35.45 g/mol, so the number of moles of Cl^- is 0.250 g / 35.45 g/mol = 0.00705 mol. The volume of the solution is 150 mL or 0.150 L. The concentration is then 0.00705 mol / 0.150 L = 0.047 M, which is approximately 4.7 × 10^-2 M, matching choice A when considering significant figures and scientific notation.

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What Is the Concentration of an AlCl₃ Solution If 150