Asked by Nancy
The triprotic acid H3A has ionization constants of Ka1 = 6.8× 10–3, Ka2 = 8.1× 10–9, and Ka3 = 5.0× 10–12. Calculate the following values for a 0.0760 M solution of NaH2A
[H+] = ?
[H2A-]/[H3A]= ?
Calculate the following values for a 0.0760 M solution of Na2HA.
[H+]= ?
[HA2-]/[H2A-]= ?
[H+] = ?
[H2A-]/[H3A]= ?
Calculate the following values for a 0.0760 M solution of Na2HA.
[H+]= ?
[HA2-]/[H2A-]= ?
Answers
Answered by
Devron
Okay, I think you can do it this way, but I am not sure:
B- + H20 ---> HB + OH
Kb=[OH-][HB-]/B
Kw=Ka*Kb=1 x 10^-14
Solve for kb=Kw/Ka= 1 x 10^-14/6.8× 10^-3=Kb
sqrt*(Kb*0.0760 M)=OH
-log(OH)=pOH
14-pOH=pH
10^(-pH)=H+ concentration.
Use the Henderson Hasselbalch equation for the second part. You know the pH and you know the pka=-log(ka)
pH=pKa=log(A-/HA), solve for the ratio.
Repeat the above steps for your second problem.
B- + H20 ---> HB + OH
Kb=[OH-][HB-]/B
Kw=Ka*Kb=1 x 10^-14
Solve for kb=Kw/Ka= 1 x 10^-14/6.8× 10^-3=Kb
sqrt*(Kb*0.0760 M)=OH
-log(OH)=pOH
14-pOH=pH
10^(-pH)=H+ concentration.
Use the Henderson Hasselbalch equation for the second part. You know the pH and you know the pka=-log(ka)
pH=pKa=log(A-/HA), solve for the ratio.
Repeat the above steps for your second problem.
Answered by
h
whattup mike
Answered by
Jake
Sup
Answered by
Bob
If you aint licking door knobs I don't know what is wrong with Phil Swift
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