[HmmHi]

Hi. I have a few questions regarding buffers.

How much 0.2M sodium hydroxide should I use to make a 1:1 buffer with 100.0 milliliters of 0.2M ethanoic acid?
I have no idea on how to start this. Can someone give me a hint? Thanks

Edit: Is it 50.00 milliliters? Because I want to add enough sodium hydroxide to neutralize half the ethanoic acid, right? 

[rabolisk]

You are correct.

[HmmHi]

I know have to calculate the pH of the buffer solution
NaOH_(aq) + CH₃COOH_(aq)   CH₃COO_(aq)^- + H₂O_(l)

-log [CH₃COO_(aq)^-] = pH?

How should I go about doing this then?

[rabolisk]

Henderson-Hasselbach Equation.