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Which of the following combinations would be the best to buffer an aqueous solution at a pH of 5.0?H3PO4 and H2PO4- (Ka=7.5e-3)HNO2 and NO2 (Ka=(4.5e-4)CH3CO2H and CH3COO (Ka= 1.8e-5)H2PO4 and HPO4 (Ka=6.2e-8)please explain why! thanks

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Jarrod Robel
Jarrod RobelLv2
28 Sep 2019

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Related questions

Which of the following combinations would be best to buffer an aqueous solution at a pH of 2.0?

a. H3PO4 and H2PO4-, Ka1 = 7.5 x 10-3

b. HNO2 and NO2-, Ka = 4.5 x 10-4

c. CH3COOH and CH3COO-, Ka = 1.8 x 10-5

d. H2PO4- and HPO42-, Ka2 = 6.2 x 10-8

Which of the following combinations of acids and conjugate baseswould be the best to create a pH 3.5 buffer?

HNO2 (Ka = 4.5 x 10-4)and NO2-
H3PO4 (Ka = 7.5 x10-3) andH2PO4-
NH4+ (Ka = 5.7 x10-10) and NH3
H2PO4- (Ka= 6.2 x 10-8) andHPO42-
HC2H3O2 (Ka= 1.8 x 10-5) andC2H3O2-

A buffer solution with a pH of 6.00 is needed in an experiment. Which of the following buffer systems would work best?

a. H2PO4/ HPO42‒ KA of H2PO4 is 6.2×10‒8

b. NH3 / NH4+ KB of NH3 is 1.8×10‒5

c. N2H4 / N2H5+ KB of N2H4 is 9.6×10‒7

d. H2CO3 / HCO3‒ KA of H2CO3 is 4.3×10‒7

e. HNO2 / NO2‒ KA of is HNO2 is 7.1×10‒4

please explain

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