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5 A diprotic acid, H2A, has the following ionization constants: Ka1=1.1103 and Ka2=2.5106. To make up a buffer solution of pH5.80, which combination would you

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5 A diprotic acid, H2A, has the following ionization constants: Ka1=1.1103 and Ka2=2.5106. To make up a buffer solution of pH5.80, which combination would you choose: NaHA/H2A or Na2A/NaHA ? 16 A student wishes to prepare a buffer solution at pH=8.60. Which of these weak acids should she choose and why: HA ( Ka=2.7103),HB(Ka=4.4106), or HC(Ka=2.6109)

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