Calculation of molar ratios of conjugate base to weak acid from ph for a weak acid with a pka of 6.0, calculate the ratio of conjugate base to acid at a ph of 5.0.

choice of weak acid for a buffer which of these com-pounds would be the best buffer at ph 5.0: formic acid (pka 5 3.8), acetic acid (pka 5 4.76), or ethylamine (pka 5 9.0)? briefly justify your answer.

Explanation:

According to the Handerson equation,  

          pH =

or,      pH =

Putting the given values into the above equation as follows.

     pH =

       5.0 = 6.0 + log \frac{\text{conjugate base}}{\text{acid}}[/tex]

      = -1.0

or,      

                            = 0.1

Therefore, we can conclude that molar ratios of conjugate base to weak acid for given solution is 0.1.

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