Aqueous Solutions of Phosphoric Acid and Sodium Nitrite Are Combined

question 97

Multiple Choice

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 K_c 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.

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