You mix 48.0 mL of 0.070 M NaOH with 24.0 mL of 0.14 M formic acid (Ka = 1.8 * 1

Question

You mix 48.0 mL of 0.070 M NaOH with 24.0 mL of 0.14 M formic acid (Ka = 1.8 * 10^-4). What molecules and ions exist in this solution? List them in order of decreasing concentration. To do this, answer the following questions.

1). How many moles of HCO2H were added to the mixture?

_______ mol

2). How many moles of NaOH were added to the mixture?

________ mol

3). What is the predominant solute present in solution after mixing the HCO2H and the NaOH solutions?

a. HCO2H (aq)

b. NaHCO2 (aq)

c. NaOH (aq)

4). What is the concentration of NaHCO2 in the solution following reaction with NaOH , but before coming to equilibrium?

Concentration = ___________ M

Thank you!

Explanation / Answer

1)

moles of HCO2H = 24.0 x 0.14 / 1000

                            = 3.36 x 10^-3

2)

moles of NaOH = 48 x 0.070 / 1000

                         = 3.36 x 10^-3

3)

predominant solute = b. NaHCO2 (aq)

4)

concentration of NaHCO2 = moles / volume

                                            = 3.36 x 10^-3 / (0.048 + 0.024)

                                            = 0.0467 M

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