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13 July, 16:53

What is the final acetate ion concentration when 69. g Ba (C2H3O2) 2 is dissolved in enough water to make 970. mL of solution? The molar mass of Ba (C2H3O2) 2 is 255.415 g/mol.

0.28 M

0.64 M

0.91 M

0.20 M

0.56 M

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  1. 13 July, 18:10
    0
    0.56M

    Explanation:

    1. Dissociation equation

    Assuming 100% dissociation, the equation is:

    Ba (C₂H₃O₂) ₂ → Ba²⁺ + 2C₂H₃O₂⁻



    acetate ions

    2. Molarity

    Calculate the molarity, M, of the solution:

    M = n / V (in liters)

    n = mass in grams / molar mass

    n = 69. g / 255.415g/mol = 0.27015 mol

    M = 0.27015mol / 0.970liter = 0.27850 mol/liter ≈ 0.28M

    3. Acetate ions

    From the chemical equation, 1 mol of dissolved Ba (C₂H₃O₂) ₂ produces 2 acetate ions in solution.

    Thus, 0.28 mol/liter * 2 = 0.56 mol/liter = 0.56M ← answer
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