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Calculation of PH,(using Henderson Hasselbalch equation)

  1. Nov 30, 2011 #1
    1. The problem statement, all variables and given/known data
    Calculate each tube's PH using the equation.In which tube precipitation will take place?why?
    Ingredients TUBE 1 2 3 4 5
    0.5 M CH3COOH(ml) 3.4 2.8 2.0 1.2 0.6
    0.5 M CH3COONa(ml) 0.6 1.2 2.0 2.8 3.4
    casein solution 0.5%(ml) 1 1 1 1 1


    given; log 0.6=-0.2218 log2=0.3010 log 3.4=0.5315 log 1.2=0.0792 log2.8=0.4472
    pk CH3COOH=4.7

    2. Relevant equations
    Ph=pk+log (A/HA)





    3. The attempt at a solution Not sure if any of these are correct
    Concentration:
    tube 1;(0.5)(3.4) + (O.5)(O.6)=1.7 + 0.3 ph =4.7+log (0,3/1,7)=3,9
    precipitation takes place in tube 2
    Thank you
     
    Last edited: Nov 30, 2011
  2. jcsd
  3. Dec 2, 2011 #2

    Borek

    User Avatar

    Staff: Mentor

    What you wrote is hard to follow, but at least I think I can confirm pH in the first tube looks OK.
     
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