Problem: Using the table below, how many of the following salts are expected to produce acidic solutions: NaHSO4, NaHC2O4, NaH2PO4, and NaHCO3?

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FREE Expert Solution

Given: NaHSO4, NaHC2O4, NaH2PO4, and NaHCO3

The cation in all of the given salts is Na+: Na+ is a main group metal cation with a +1 charge  Na+ is a neutral ion


Therefore, we have to look at the anion.  Compare Ka and Kb:

Recall that

Kw=Ka×Kb

The Kb of S2 is:

Kb=KwKa2


For NaHSO4: NaHSO4 dissociates to form Na+ and HSO4.

Anion: HSO4 

Ka2 of H2SO4 = 1.2 × 10–2

The Kb of HSO4 is:

Kb=1.0×10-141.2×10-2 

Kb = 8.33 × 10–2

Ka Kb

NaHSO4 will produce an acidic solution.



For NaHC2O4: NaHC2O4 dissociates to form Na+ and HC2O4.

Anion: HC2O4 

Ka2 of H2C2O4 = 6.4 × 10–5

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Problem Details

Using the table below, how many of the following salts are expected to produce acidic solutions: NaHSO4, NaHC2O4, NaH2PO4, and NaHCO3?

Acid-Dissociation Constants of Some Common Polyprotic Acids


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