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Which of the following is the most effective buffer system for a pH value of 4.45?

Which of the following is the most effective buffer system for a pH value of 4.45?



a. H2CO3/HCO3- (K1 = 4.4 * 10-7)

b. HCO3-/CO32- (K2 = 4.7 * 10-11)

c. H2S/HS- (K1 = 1.0 * 10-7)

d. HC2O4-/C2O42- (K2 = 5.0 * 10-5)

e. H3PO4/H2PO4- (K1 = 7.5 * 10-3)

I Think (d) not really sure.Thanks

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Which of the following is the most effective buffer system for a pH value of 4.45? a. H2CO3/HCO3- (K1 = 4.4 * 10-7)
b. HCO3-/CO32- (K2 = 4.7 * 10-11)
c. H2S/HS- (K1 = 1.0 * 10-7)
d. HC2O4-/C2O42-...

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