Phosphoric acid (H₃PO₄) has three dissociable protons, with the pK_a's shown below. Which form of phosphoric acid predominates in a solution at pH 4? Explain your answer.
Acid
pK_a
H₃PO₄
2.14
H₂PO₄^-
6.86
HPO₄²^-
12.4

Question

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The Answer of Phosphoric acid (H₃PO₄) has three dissociable protons, with the pK_a's shown below. Which form of phosphoric acid predominates in a solution at pH 4? Explain your answer. Acid pK_a H₃PO₄ 2.14 H₂PO₄^- 6.86 HPO₄²^- 12.4

Phosphoric Acid (H3PO4) Has Three Dissociable Protons, with the PKa's

Phosphoric Acid (H₃PO₄) Has Three Dissociable Protons, with the PK_a's