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Angelina_Jolie [31]
3 years ago
13

You are asked to prepare a buffer solution with a pH of 3.50. The following solutions, all 0.100 M, are available to you: HCOOH,

CH3COOH, H3PO4 , NaCHOO, NaCH3COO, and NaH2PO4.  What would be the best combination to make the required buffer solution? Select one:
a. NaH2PO4 and NaCHOO  
b. H3PO4 and NaH2PO4
c. NaH2PO4 and HCOOH
d. CH3COOH and NaCH3COO e. HCOOH and NaCHOO
can someone helo me with this​
Chemistry
1 answer:
Brrunno [24]3 years ago
3 0

Answer:

e. HCOOH and NaCHOO

Explanation:

For a buffer solution, both an acid and its conjugate base are required.

With the information above in mind, we can<em> discard options a) and c</em>), as those combinations are not of an acid and its conjugate base.

Now it is a matter of <u>comparing the pKa (found in literature tables) of the acids of the remaining three acids</u>:

  • H₃PO₄ pKa = 2.12
  • CH₃COOH pKa = 2.8
  • HCOOH pKa = 3.74

The acid with the <u>pKa closest to the desired pH</u> is HCOOH, so the correct answer is e. HCOOH and NaCHOO

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