1. Limited time only! Sign up for a free 30min personal tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Homework Help: Amount of starting material needed for Buffer

  1. Sep 11, 2008 #1
    given .1M of formic and .1M formate, how do you make 40 ml of .1M Buffer ph=2.9

    basically it's going to equal .141=[tex]\frac{base}{acid}[/tex] after going through henderson hasselbach

    Does anyone know how to do this using an ICE table?
  2. jcsd
  3. Sep 11, 2008 #2


    User Avatar

    Staff: Mentor

    ICE table is of no use here.

    You have two equations. Total volume:

    [tex]V_{base} + V_{acid} = 40[/tex]

    and ratio of concentrations (as given by Henderson-Hasselbalch equation):

    [tex]\frac {0.1*V_{base}} {V_{base} + V_{acid}} = 0.141 * \frac {0.1*V_{acid}} {V_{base} + V_{acid}} [/tex]

    Note that what I have put on both sides is just amount of substance divided by total volume, nothing fancy. Just solve.

    Buffer Maker - the ultimate buffer calculator
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook