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Consider the following polyprotic reactions: H₃A (aq) + H₂O (l) ⇌ H₃O⁺ (aq) + H₂A (aq) H₂A⁻ (aq) + H₂O (l) ⇌ H₃O⁺ (aq) + HA²⁻ (aq) HA²⁻ (aq) + H₂O (l) ⇌ H₃O⁺ (aq) + A³⁻ (aq) Ka1= 1.4 x 10⁻³ Ka₂= 1.1 x 10⁻⁷ Ka₃ 1.8 x 10⁻¹¹ If the targeted pH for your buffer is 7.5 what are the predominant proton donor and proton acceptor in solution? Below the answer options are in the order of proton donor/proton acceptor. A) H₃A/H₂A⁻ B) H₂A⁻/HA2- C) HA²⁻/H₂A⁻ D) H₃A/ A³⁻ E) H₂A⁻/H₃A
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