Which acid-base pair would be the best choice to prepare a buffer solution with pH = 8.0? HNO2 and NaNO2 (pKa = 3.20) NaH2PO4 and Na2HPO4 (pKa = 7.21) [C5H5NH]Cl and C5H5N (pKa = 5.30) H3PO4 and NaH2PO4 (pKa = 2.12)

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12 Dec 2019

Which acid-base pair would be the best choice to prepare a buffer solution with pH = 8.0?

HNO₂ and NaNO₂ _{(pKa = 3.20)}

NaH₂PO₄ and Na₂HPO_{4 (pKa = 7.21)}

[C₅H₅NH]Cl and C₅H₅N (pKa = 5.30)

H₃PO₄ and NaH₂PO_{4 (pKa = 2.12)}

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using NaH2PO4 and Na2HPO4 both are stock solutions of .2 M

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im not sure if you need the gram values from the preceding problems for 50 ml solutions.. we went over this today the formula was something like
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Which acid-base pair would be the best choice to prepare a buffer solution with pH = 8.0?

HNO₂ and NaNO₂ _{(pKa = 3.20)}

NaH₂PO₄ and Na₂HPO_{4 (pKa = 7.21)}

[C₅H₅NH]Cl and C₅H₅N (pKa = 5.30)

H₃PO₄ and NaH₂PO_{4 (pKa = 2.12)}

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		HNO₂ and NaNO₂ _{(pKa = 3.20)}
		NaH₂PO₄ and Na₂HPO_{4 (pKa = 7.21)}
		[C₅H₅NH]Cl and C₅H₅N (pKa = 5.30)
		H₃PO₄ and NaH₂PO_{4 (pKa = 2.12)}