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Chapter 10: QEE (page 230)
(c) Calculate the percentage in the major form at each pH.
When the pH is raised to 11, the dihydroxy benzene takes on two forms: one deprotonated and one protonated.
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A dibasic compound, B, has pKb1 5 4.00 and pKb2 5 6.00.
Find the fraction in the form at pH 7.00, using Equation
10-19. Note that K1 and K2 in Equation 10-19 are acid dissociation
constants forlocalid="1655450143786"
1 (K1 = Kw/Kb2 and K2 = Kw/Kb1).
What volume of KOH would bring the pH to 4.50?
Starting with the fully protonated species, write the step wise acid dissociation reactions of the amino acids glutamic acid and tyrosine. Be sure to remove the protons in the correct order. Which species are the neutral molecules that we call glutamic acid and tyrosine?
Phosphate atis one of the main buffers in blood plasma, whose pH is 7.45. Would phosphate be as useful if the plasma pH were 8.5?
We will abbreviate malonic acid, , as . Find the pH and concentrations of , and in
(a) ;
(b) ;
(c) .
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