Determining pH when given volume and concentration of a solution?

  • Thread starter Violagirl
  • Start date
  • #1
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Homework Statement



I'm stuck on these two problems:

A) IF you make a 50 mL of a 0.1 M Tris solution (in acid form), what will be the pH?

B) If you add 2 mL of 1 M NaOH to the above solution, what will be the pH?

Homework Equations



pH = pka + log [A/HA] Hendersen-Hasselbalch

The Attempt at a Solution



I'm not sure if HH is the right equation to use or not for this one when given both volume and concentration or if you add the NaOH to it. Help is greatly appreciated.
 

Answers and Replies

  • #2
3,816
93

Homework Statement



I'm stuck on these two problems:

A) IF you make a 50 mL of a 0.1 M Tris solution (in acid form), what will be the pH?

B) If you add 2 mL of 1 M NaOH to the above solution, what will be the pH?

Homework Equations



pH = pka + log [A/HA] Hendersen-Hasselbalch

The Attempt at a Solution



I'm not sure if HH is the right equation to use or not for this one when given both volume and concentration or if you add the NaOH to it. Help is greatly appreciated.

It would help if you could define what "Tris solution (in acid form)" is.
 
  • #3
114
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I'm not sure, that is the exact way that the question was asked...Is it referring to a Tris buffer of a 100% solution?
 
  • #4
Borek
Mentor
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3,565
I can only repeat after Pranav-Arora - what does it mean "Tris in acid form"? What other forms can Tris have?
 
  • #5
665
307
This might help you.......
160px-Tris.png

http://en.wikipedia.org/wiki/Tris
 
Last edited:
  • #6
epenguin
Homework Helper
Gold Member
3,892
920
You can buy tris which they call tris base (HOCH2)3CNH2, and you can buy tris hydrochloride (crystalline) (HOCH2)3CNH3+Cl-, I think the latter is what they must mean.
 

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