what is the ph of a buffer solution that was prepared by mixing 100ml of 2.00m...
what is the ph of a buffer solution that was prepared by mixing 100ml of 2.00m propionic acid ch3ch3cooh;pka=4.87) solution and a 45ml of 0.095 M sodium hydroxide solution ?
Homework Answers
Let the acid be denoted as HA
and its pKa = 4.87
the reaction is
HA + NaOH -------------------> NaA + H2O
100x2.0=200 45x0.095=4.275 0 0 initial mmoles
195.725 0 4.275 --------- at equilibrium
The pH of this buffer is given by Hendersen equation as
pH = pKa + log [conjugate base]/[acid]
= 4.87 + log 4.275/195.725
= 3.209
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