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In the laboratory a student combines 39.3 mL of a 0.261 M ammonium acetate solution with...

In the laboratory a student combines 39.3 mL of a 0.261 M ammonium acetate solution with 13.7 mL of a 0.493 M ammonium fluoride solution. What is the final concentration of ammonium cation ?

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Answer #1

moles of CH3COONH4 = 39.3 x 0.261 / 1000 = 0.0103

moles of NH4F = 13.7 x 0.493 / 1000 = 0.00675

final concentration of NH4+ = 0.0103 + 0.00675 / (39.3 + 13.7)

                                         = 3.21 x 10^-4 M

final concentration of NH4+ = 3.21 x 10^-4 M

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