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of the following solution at approximately 77 Ionization Constants for Aqueous W

ID: 1046141 • Letter: O

Question

of the following solution at approximately 77 Ionization Constants for Aqueous Weak Acids at 25°C Acid Ka (pKa) 1.3 x 10-3 (2.89) 1.8 x 10-5 (4.74) Weak Acid Conjugate Base Phthalic acid, CoH4(COH)2 Hydrogen phthalate ion Acetic acid, CH3CO2HAcetate ion, CH3 CO2 Dihydrogen phosphate ion, C6H4 (CO2H)(C02) Hydrogen phosphate ion, HPO,26.2 x 10 H2PO4 Hydrogen phosphate ion, HPO42 Phosphate ion, PO4 3.6 10-13 (12.44) Na2 HPO4 and Nag P04 NaH2PO4 and Na2 HPO4 H3PO4 and NaH2PO4 Submit Answer Try Another Version 2 item attempts remaining

Explanation / Answer

(b)

NaH2PO4 and Na2HPO4 is best buffer to have pH is about 7.0 as its pKa is 7.21

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