QuestionFebruary 20, 2026

Sequence the following equations in the steps of the ionization of phosphoric acid in the correct order. HPO_(4)^2-(aq)+H_(2)O(l)leftharpoons H_(3)O^+(aq)+PO_(4)^3-(aq) H_(3)PO_(4)(aq)+H_(2)O(l)leftharpoons H_(3)O^+(aq)+H_(2)PO_(4)^2-(aq) H_(2)PO_(4)^-(aq)+H_(2)O(l)leftharpoons H_(3)O^+(aq)+HPO_(4)^-(aq)

Sequence the following equations in the steps of the ionization of phosphoric acid in the correct order. HPO_(4)^2-(aq)+H_(2)O(l)leftharpoons H_(3)O^+(aq)+PO_(4)^3-(aq) H_(3)PO_(4)(aq)+H_(2)O(l)leftharpoons H_(3)O^+(aq)+H_(2)PO_(4)^2-(aq) H_(2)PO_(4)^-(aq)+H_(2)O(l)leftharpoons H_(3)O^+(aq)+HPO_(4)^-(aq)
Sequence the following equations in the steps of the ionization of
phosphoric acid in the correct order.
HPO_(4)^2-(aq)+H_(2)O(l)leftharpoons H_(3)O^+(aq)+PO_(4)^3-(aq)
H_(3)PO_(4)(aq)+H_(2)O(l)leftharpoons H_(3)O^+(aq)+H_(2)PO_(4)^2-(aq)
H_(2)PO_(4)^-(aq)+H_(2)O(l)leftharpoons H_(3)O^+(aq)+HPO_(4)^-(aq)

Solution
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Answer

1. H_{3}PO_{4}(aq)+H_{2}O(l)\rightleftharpoons H_{3}O^{+}(aq)+H_{2}PO_{4}^{-}(aq) ### 2. H_{2}PO_{4}^{-}(aq)+H_{2}O(l)\rightleftharpoons H_{3}O^{+}(aq)+HPO_{4}^{2-}(aq) ### 3. HPO_{4}^{2-}(aq)+H_{2}O(l)\rightleftharpoons H_{3}O^{+}(aq)+PO_{4}^{3-}(aq) Explanation 1. Identify first ionization Phosphoric acid first loses one proton: H_{3}PO_{4} + H_{2}O \rightarrow H_{3}O^{+} + H_{2}PO_{4}^{-} 2. Identify second ionization Dihydrogen phosphate loses a proton: H_{2}PO_{4}^{-} + H_{2}O \rightarrow H_{3}O^{+} + HPO_{4}^{2-} 3. Identify third ionization Hydrogen phosphate loses final proton: HPO_{4}^{2-} + H_{2}O \rightarrow H_{3}O^{+} + PO_{4}^{3-}

Explanation

1. Identify first ionization <br /> Phosphoric acid first loses one proton: $H_{3}PO_{4} + H_{2}O \rightarrow H_{3}O^{+} + H_{2}PO_{4}^{-}$ <br /><br />2. Identify second ionization <br /> Dihydrogen phosphate loses a proton: $H_{2}PO_{4}^{-} + H_{2}O \rightarrow H_{3}O^{+} + HPO_{4}^{2-}$ <br /><br />3. Identify third ionization <br /> Hydrogen phosphate loses final proton: $HPO_{4}^{2-} + H_{2}O \rightarrow H_{3}O^{+} + PO_{4}^{3-}$
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