Ask a New Question
Menu

4) 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 is D.
Because when i work out , i am uing
-log 5* 10-5 that is close to 4.3. Is that true Can u help me, Thanks

1 answer

That's right. You want the pKa value to be as close to the desired pH as possible. D fits the closest.
Similar Questions
  1. Which is the main buffer system found in the ECF?A)HCI /NaOH buffer system B)phosphate buffer system C)CO2 / HCO3 buffer system
    1. answers icon 1 answer
  2. You have to design a buffer based on one of the systems belowSystem 1: HA1 and A1-1 K= 4 E-3 System 2: HA2 and A2-1 K= 5 E-4
    1. answers icon 1 answer
  3. You have to design a buffer based on one of the systems belowSystem 1: HA1 and A1-1 K= 4 E-3 System 2: HA2 and A2-1 K= 5 E-4
    1. answers icon 1 answer
  4. Is this a buffer system? NH3/(NH4)2SO4?It is formed by mixing NH3 (weak base) and a strong acid (H2SO4), but according to my
    1. answers icon 3 answers
more similar questions