Determine whether the predominant form of the followingamphoteric species (indic

Question

Determine whether the predominant form of the followingamphoteric species (indicated in bold) is acidic, basic, orneutral:

hydrogen chromate ion -HCrO4  (chromicacid - H2CrO4: pKa1 = 0.74;pKa2 = 6.49)
hydrogen oxalate ion -HOOCCO2  (oxalicacid - HOOCCOOH: pKa1 = 1.23; pKa2 =4.19) Determine whether the predominant form of the followingamphoteric species (indicated in bold) is acidic, basic, orneutral:

hydrogen chromate ion -HCrO4  (chromicacid - H2CrO4: pKa1 = 0.74;pKa2 = 6.49)
hydrogen oxalate ion -HOOCCO2  (oxalicacid - HOOCCOOH: pKa1 = 1.23; pKa2 =4.19)

Explanation / Answer

We Know that : H2CrO4 ---------> H+ + HCrO4- pKa = 0.74    HCrO4- -------->H+ + CrO4-2   pKa = 6.49       TheHCrO4- is Acidic because pKa islower than 7    H2C2O4 ------> H+ + HC2O4-   pKa =1.23      HC2O4-   ------->H+ + C2O4-2 pKa = 4.19         TheHC2O4- is Acidicbecause pKa is lower than 7

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