Three scenarios: I. Mixing of a weak conjugate acid (i.e., HOOCCH3 (aq)) with it

Question

Three scenarios:

I. Mixing of a weak conjugate acid (i.e., HOOCCH3 (aq)) with its weak conjugate base (i.e., NaOOCH3(aq)):
You need to produce an acidic buffer solution that has a pH of 5.420. Does Ka>Kb for an acidic buffer? Yes or no. You already have a solution that contains 10.0 mmol (millimoles) of acetic acid. How many millimoles of "acetate" (the conjugate base of acetic acid or salt of the weak acid, acetic acid) will you need to add to this solution? The pKa for acetic acid is 4.742 at 298K. Calculate the Ka value from the pKa value:_______.

II. Mixing a weak acid (i.e., HOOCCH3(aq)) with a strong base (i.e., NaOH): The limiting reagent is______: why?
For example, mix 100.0 mL of 0.200 M HOOCCH3(aq) with 50.00 mL of 0.100 M NaOH, calculate the final pH.

III. Mixing a strong acid (i.e., HNO3(aq)) with a weak base (i.e., NaOOCCH3(aq)): The limiting reagent
is ______.
For example, mix 50.0 mL of 0.100 M HNO3 (aq) with 100.00 mL of 0.200 M NaOOCCH3(aq), calculate the final pH.

Explanation / Answer

yes

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