Acid Ka CB Kb H2CO3 4.2 x 10-7 HCO3- 2.4 x 10-8 HCO3- 4.8 x 10-11 CO32- 2.1 x 10-4 You are to prepare a "carbonate"

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Acid Ka CB Kb H2CO3 4.2 x 10-7 HCO3- 2.4 x 10-8 HCO3- 4.8 x 10-11 CO32- 2.1 x 10-4 You are to prepare a "carbonate" buffer with pH of 10.35. Youare given carbonic acid (H2CO3). sodiumhydrogen carbonate (NaHCO3), and sodium carbonate(Na2CO3). H2CO3 + H2O <----> H3O+ +HCO3- HCO3- + H2O <---> H3o+ +CO3- CO32- + H2O <--->HCO3- + OH- a) Using the information in the chart about Ka/Kb values, whichspecies will you use? Explain your choice? b) Which component will be present in the larger amount? c) You are given a 0.025M solution of the acid and a 0.025Msolution of the conjugate base. Calculate how many mL of each youwould use to make the buffer.

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Acid	Ka	CB	Kb
H₂CO₃	4.2 x 10^-7	HCO₃^-	2.4 x 10^-8
HCO₃^-	4.8 x 10^-11	CO₃^2-	2.1 x 10^-4

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Acid Ka CB Kb H2CO3 4

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