Homework Help: Chemistry

Posted by Mark on Saturday, January 19, 2013 at 11:52pm.

You have 475 mL of an 0.47 M acetic acid solution. What volume (V) of 1.10 M NaOH solution must you add in order to prepare an acetate buffer of pH = 5.00?

Chemistry - DrBob222, Sunday, January 20, 2013 at 1:06am
475 mL x 0.47 = 223 mmols HAc

.........HAc + OH^- ==> Ac^- + H2O
initial..223....0........0.......0
add.............x................
change...-x....-x........x.......x
equil...223-x....0.......x........x

Substitute the equil line into the Henderson-Hasselbalch equation and solve for x = millimols OH^- to be added.
Then M = mmols/mL or mL = mmols/M and solve for mL.

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