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Topic: Determining a Buffer Solution  (Read 1775 times)

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Offline stringpaper

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Determining a Buffer Solution
« on: February 26, 2013, 09:41:03 PM »
I know that a buffer solution is made from a weak acid and its conjugate base.

However, in a problem in which different concentrations of acid & base are given, how do you figure out which concentrations make the buffer solution?

Thanks for any and all help :)
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Offline Hunter2

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Re: Determining a Buffer Solution
« Reply #1 on: February 27, 2013, 01:10:15 AM »
Buffer solutions are calculate with the Henderson-Hasselbalch-equation. Refer to this.
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Offline Borek

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Re: Determining a Buffer Solution
« Reply #2 on: February 27, 2013, 03:42:22 AM »
Usually we assume buffer works OK when pH doesn't differ by more than 1 unit from the pKa (pKb) of the substance used for buffer preparation. You can easily convert that to concentrations of the acid and its conjugate base.
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