- #1
cloveryeah
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Please post in HW section and please use the HW template.
Ka values of the 1st and 2nd dissociation of phthalic acid (HO2C-C6H4-CO2H) are
given below. Estimate the pH value for highest buffer capacity when a buffer is
prepared from 1:1 mixture of phthalic acid and sodium hydrogen phthalate (HO2CC6H4-
CO2Na) in water?
HO2C-C6H4-CO2H <=> H+ +HO2C-C6H4-CO2- Ka1=1.3X10^-3
HO2C-C6H4-CO2- <=> H+ + -O2C-C6H4-CO2- Ka2=3.1X10^-6
so i m wondering that whether the pH (we want to find when buffer capacity is the highest) is just depends on Ka1...?
or Ka2 is counted also??
given below. Estimate the pH value for highest buffer capacity when a buffer is
prepared from 1:1 mixture of phthalic acid and sodium hydrogen phthalate (HO2CC6H4-
CO2Na) in water?
HO2C-C6H4-CO2H <=> H+ +HO2C-C6H4-CO2- Ka1=1.3X10^-3
HO2C-C6H4-CO2- <=> H+ + -O2C-C6H4-CO2- Ka2=3.1X10^-6
so i m wondering that whether the pH (we want to find when buffer capacity is the highest) is just depends on Ka1...?
or Ka2 is counted also??