Aqueous solutions of phosphoric acid and sodium nitrite are combined, and the fo

Question

Aqueous solutions of phosphoric acid and sodium nitrite are combined, and the following equilibrium is established. H3PO4(aq) + NO2-(aq) <----> H2PO4-(aq) + HNO2(aq) The equilibrium constant Kc for this reaction is greater than one. Based on this information, which of the following statements is correct?

A) Phosphoric acid is a weaker acid than nitrous acid.

B) Nitrous acid is a weaker acid than water.

C) The nitrite anion is a weaker base than the dihydrogen phosphate anion.

D) The dihydrogen phosphate anion is a stronger acid than nitrous acid.

E) Phosphoric acid is a stronger acid than nitrous acid.

Explanation / Answer

Given, Kc>1.

this implies that reaction favors forward direction. So, the predominating species are products.

And it happens only when the reactants are stronger than products.

Thus, H3PO4 is stronger acid than Nitrous acid.

Option E is correct.

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