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:
The Kb of S2– is:
For NaHSO4: NaHSO4 dissociates to form Na+ and HSO4–.
Ka2 of H2SO4 = 1.2 × 10–2
The Kb of HSO4– is:
Kb = 8.33 × 10–2
Ka > Kb
NaHSO4 will produce an acidic solution.
For NaHC2O4: NaHC2O4 dissociates to form Na+ and HC2O4–.
Ka2 of H2C2O4 = 6.4 × 10–5
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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