Making Buffers with pHs of 4.2, 7.3, 9.7

[coryvett06]

I have a Question that I cannot figure out:

Describe how to make a buffer with pHs of 4.2, 7.3, and 9.7. For each buffer, you will need to choose a different method. For ex., if you make a buffer using a conjugate pair, you cannot reuse this method for the other 2 buffers...

I just don't know where to go w/ it?? I've used pH=pKa + log (base/acid) for the 4.2 buffer and am just stuck...

thanks

 

[Borek]

I think what they mean is that you have to use different conjugate pairs, buffer by definition contains conjugate pair, so you can't make one without one

Please don't reuse old therads to ask new questions.