What concentration of propanoic acid, HC2H5CO2(aq), is needed to prepare a buffer system that contains 0.066...
What concentration of propanoic acid, HC2H5CO2(aq), is needed to prepare a buffer system that contains 0.066 M sodium propanoate, C2H5CO2Na, and has a pH of 4.29 at 25°C? The Ka value of propanoic acid is 1.3 ✕ 10−5.
Homework Answers
pKa = - log ( Ka )
= - log ( 1.3*10^-5)
= 4.886
pH = pKa + log ( C2H5CO2Na / C2H5CO2H)
= 4.29 = 4.886 + log ( 0.066 / C2H5CO2H)
= C2H5CO2H = 0.2603 M
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