Select the only one of the alternatives that IS NOT CORRECT. Justify: A. When the pKa of a weak acid is 4.0, 50% of its molecules will be in the state dissociated when the pH of the surrounding environment is 4.0. B. A weak acid with a pKa of 4.0 will be a more effective buffer at pH 3.8 than at pH 5.7. C. At a pH equal to its pI, a polypeptide does not carry charged clumps. D. Strong acids and strong bases are so named because they undergo complete dissociation when dissolved in water. E. The pKa of an ionizable group can be influenced by physical properties and chemistries of its adjacent environment
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Select the only one of the alternatives that IS NOT CORRECT.
Justify:
A. When the pKa of a weak acid is 4.0, 50% of its molecules will be in the state dissociated when the pH of the surrounding environment is 4.0.
B. A weak acid with a pKa of 4.0 will be a more effective buffer at pH 3.8 than at pH 5.7.
C. At a pH equal to its pI, a polypeptide does not carry charged clumps.
D. Strong acids and strong bases are so named because they undergo complete dissociation when dissolved in water.
E. The pKa of an ionizable group can be influenced by physical properties and chemistries of its adjacent environment