Phosphoric Acid Is a Triprotic Acid, Ionizing in the Following

question 42

Multiple Choice

Phosphoric acid is a triprotic acid, ionizing in the following sequential steps: H₃PO₄  H₂O H₂PO₄^  H₃O^ H₂PO₄^  H₂O HPO₄^2  H₃O^
HPO₄^2  H₂O PO₄^3  H₃O^ Which equilibrium is most important in determining the pH of a solution of sodium phosphate?

• A)HPO₄^{2 }  H₂O PO₄^{3 }  H₃O ^
• B)H₃PO₄  H₂O H₂PO₄ ^  H₃O ^
• C)PO₄^{3 }  H₂O HPO₄^{2 }  OH ^
• D)H₂PO₄ ^  H₂O H₃PO₄  OH ^
• E)2H₂O H₃O ^  OH ^

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