Amount of starting material needed for Buffer

thephoenician

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?

Borek

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.

Borek
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