Carbonic acid (H2CO3, Ka = 4.2 x 10–7), can be found in a wide variety of body f

Question

Carbonic acid (H2CO3, Ka = 4.2 x 10–7), can be found in a wide variety of body fluids. a. Calculate the hydrogen ion concentration of a 0.000545 M solution b. What is the concentration of CO32- c. What is the Kb of the H2CO3 solution Carbonic acid (H2CO3, Ka = 4.2 x 10–7), can be found in a wide variety of body fluids. a. Calculate the hydrogen ion concentration of a 0.000545 M solution b. What is the concentration of CO32- c. What is the Kb of the H2CO3 solution Carbonic acid (H2CO3, Ka = 4.2 x 10–7), can be found in a wide variety of body fluids. a. Calculate the hydrogen ion concentration of a 0.000545 M solution b. What is the concentration of CO32- c. What is the Kb of the H2CO3 solution

Explanation / Answer

H2CO3 ---> H+ + HCO3-

Ka= [H+] [HCO3-]/[H2CO3]     =4.2*10-7 =x2/(0.000545-x)

where x= equilibrium concentration of H+. Solving rhe above equation using excel gives x= 0.0000149

pH= -log(0.0000149)=4.83 since Carbonic acid concentration initially is less, the perecent first ionization is less, the concentration of CO3-2 as a result of ionization HCO3-   ---------> CO3-2 + H+ will be much more less and can be expected to be less.

Ka*Kb= 10-14 , Kb=10-14/ 4.2*10-7 =2.38*10-8

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