When we discussed H 3 PO 4 in Section 18.9, we developed a recurring relation for the

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When we discussed H3PO4 in Section 18.9, we developed a recurring relation for the dissociation in Eqn. 18.50. Later we gave with verbal argument a binding polynomial in Eqn. 18.90.

(a) Write the series of binding reactions for PO43– and derive the Eqn. 18.50.

(b) Create a plot of  vs. pH for PO43–.

 C = [PO](1++KKK [H+] + [H+1 Ka3 Ka3Ka2 Ka3 Ka2Ka al = El+H] [PO-](1+Kbind [H+] + Kbind Kbind[H+] + KbindKbind

1 3 = C [HPO4] = 1 + [HPO4] [HPO-] [PO-] [HPO4] [H3PO4] [HPO4] + + = 1 + K al [H+] + Kalka2 + [H+] Kalka2ka3

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