trewiggles1145 trewiggles1145

31-03-2018
Chemistry

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What is the ratio of the molarities of po3− 4 and hpo2− 4 ions in a buffer solution having a ph of 10.92?

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superman1987 superman1987

11-04-2018

when we have Pka = 12.68 (missing in your question)

so by using H- H equation we can get the molarity ratio:

PH = Pka + ㏒ [conjugate base/ weak acid]

when we have PH= 10.92

and Pka = 12.68

so by substitution:

10.92 = 12.68 + ㏒ [PO3-4]/[HPO2-4 ]

∴ [PO3-4]/[HPO2 -4] = 0.017

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