Succinic acid (H2C4H6O4), which we will denote H2Suc, is a biologically relevant

Question

Succinic acid (H2C4H6O4), which we will denote H2Suc, is a biologically relevant diprotic acid with the structure shown below (Figure 1) . It is closely related to tartaric acid and malic acid. At 25 C, the acid-dissociation constants for succinic acid are Ka1=6.9×105 and Ka2=2.5×106.

A. Determine the pH of a 0.33 M solution of H2Suc at 25 C, assuming that only the first dissociation is relevant.

B. Determine the molar concentration of Suc2 in the solution in part (a).

C. Will a solution of the salt NaHSuc be acidic, neutral, or basic?

Explanation / Answer

A)

Ka1 = 6.9×10^5

concentration C = 0.33 M

[H+] = sqrt (Ka x C)

       = sqrt (6.9×10^5 x 0.33)

       = 4.77 x 10^-3 M

pH = -log H+ = -log (4.77 x 10^-3)

      = 2.32

pH = 2.32

B)

[Suc2-] = Ka2 = 2.5×10^6 M

[Suc2-] = 2.5×10^6 M

C)

still NaHSuC has one proton . so it has acidic salt

or we can check out for this :

pH of salt = (pKa1 + pKa2)/2

                = 4.88

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