When 200 ML of a 0

question 44

Multiple Choice

When 20.0 mL of a 0.250 M (NH₄) ₂S solution is added to 150.0 mL of a solution of Cu(NO₃) ₂, a CuS precipitate forms.The precipitate is then filtered from the solution, dried, and weighed.If the recovered CuS is found to have a mass of 0.3491 g, what was the concentration of copper ions in the original Cu(NO₃) ₂ solution?

• A)3.65 × 10^-3 M
• B)1.22 × 10^-2 M
• C)3.33 × 10^-2 M
• D)4.87 × 10^-2 M
• E)2.43 × 10^-2 M

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