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22. For phosphoric acid, Ka,1 = 7.6 × 10⁻³, Ka,2 = 6.2 × 10⁻⁸, Ka,3 = 4.8 × 10⁻¹³. In order of decreasing concentrations, which of the following is correct about the concentration of the listed species present in a solution of H3PO4 at pH = 8? 

I. [PO4³⁻] II. [HPO4²⁻] III. [H2PO4⁻] IV. [H3PO4] 


(A) I > II > III > IV
(B) I > III > IV > II
(C) III > II > IV > I
(D) IV > I > III > II
(E) IV > III > II > I


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 【站僕】摩檸Morning:有沒有達人來解釋一下?
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22. For phosphoric acid, Ka,1 = 7.6 × 10..-阿摩線上測驗