GEN chem question

[predentgal]

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How many milliliters of 0.05 M HCl are required to turn 20 ml of 0.05 M KOH into a solution of pH 2.00?

The answer is 30 ml. Any thoughts on how to solve?

Thankss

 

[Simple Jack]

you'll need the dreaded "henderson-hasselbalch" equation for that one

 

[MichaelWestin]

http://more.studentdoctor.net/showthread.php?t=536957

 

[CANgnome]

you'll need the dreaded "henderson-hasselbalch" equation for that one

HH is only for weak acids and bases.

 

[Simple Jack]

HH is only for weak acids and bases.

yeah it only gives approximations anyways, like in this case I think it spit out around 36-37ml, which may or may not have been helpful from the give answer choices. some other limitations can be found on wikipedia