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saraly

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How much of each solution will you need to mix to obtain 100 – 120 ml of 20 mM buffer pH 4.0?A. 35 ml sodium acetate + 90 ml
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Thanks, I really appreciate all your help!
Can you please explain the next steps?
10^-0.8= .158/1 ?
That information is part of a table with more pka's, and i'm sure it's not a decimal in between the 4 and 8. I will try it with the decimal anyway, maybe it was a mistake.
I simply do not understand how I am going to get one of those answers. This problem comes after a video explaining pH and buffers, only I didn't understand at all, to be sincere, the work shown with the few given examples.
This is the information given to me in the question. -Acetic acid pKa values(s) 4,8 MW 60.1 I replace the pKa with whichever of the two, 4 or 8, given pKa? pH = pKa + lg (base)/(acid) 4= 8 + lg (base)/(acid) So then ratio of base/acid= lg(-4)?
Would I have to substitute the base/acid with the number given in the answers?

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