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A student wishes to prepare a buffer solution at pH = 5.60. Which of these weak...

A student wishes to prepare a buffer solution at pH = 5.60. Which of these weak acids (HA, HB and HC) should he/she choose: HA (pKa = 2.57), HB (pKa = 5.36), or HC (pKa = 8.59)?

Select one:

a. Only HA

b. Only HC

c. Only HB

d. HA or HB

e. None of HA, HB or HC

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Answer #1

For weak acid HB: From, Henderson Equation we get- (5.60 – 5:36) [pka fors HB2536] 0.24 salt) Tacid ] = 100.24 1.737 so gt is

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