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10 March, 16:13

If 10.0 mL of 0.350 M aqueous NaNO3 is mixed with 50.0 mL of 0.170 M aqueous KNO3, what is the molarity of nitrate ion?

A) 0.185 M

B) 0.200 M

C) 0.260 M

D) 0.520 M

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Answers (1)
  1. 10 March, 16:31
    0
    0.200 mol/L

    Explanation:

    1. Moles of nitrate in first solution

    Moles = volume * concentration

    n = 0.0100 L * 0.350 mol/L = 0.003 500 mol

    2. Moles of nitrate in second solution

    n = 0.0500 L * 0.170 mol/L = 0.008 500 mol

    3. Total moles of nitrate

    n = 0.003 500 + 0.008 500 = 0.012 000 mol

    4. Total volume of solution

    V = 10.0 + 50.0 = 60.0 mL = 0.0600 L

    5. New concentration of nitrate

    c = moles/litres

    c = 0.012 000 mol/0.0600 L = 0.200 mol/L

    The molar concentration of nitrate ion is 0.200 mol/L.
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