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(a)
Interpretation:
The pH at which the zwitter ion [Z] and the cationic form [C+] of the amino acid alanine become equal needs to be calculated.
Concept introduction:
- Amino acids are organic compounds composed of C, H, N and O. The two main
functional groups include the amino −NH2 and carboxyl −COOH group in addition to a side chain each with a characteristic pKa value. - Isoelectric point (pI) is the pH at which the net charge on the amino acid is zero. For amino acid with one −COOH and one −NH2, the pI is given as:
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Answer to Problem 30QAP
pH = 2.29
Explanation of Solution
The given amino acid is alanine which has the following structure:
The structures of the respective cationic form (C+), zwitter ion (Z) and the anionic form (A-) are:
The acid-base equilibria for alanine involving the cation and the zwitter ion forms is:
(b)
Interpretation:
The pH at which the zwitter ion [Z] and the anionic form [A-] of the amino acid alanine become equal needs to be calculated
Concept introduction:
- Amino acids are organic compounds composed of C, H, N and O. The two main functional groups include the amino −NH2 and carboxyl −COOH group in addition to a side chain each with a characteristic pKa value.
- Isoelectric point (pI) is the pH at which the net charge on the amino acid is zero. For amino acid with one −COOH and one −NH2, the pI is given as:
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Answer to Problem 30QAP
pH = 9.74
Explanation of Solution
The given amino acid is alanine which has the following structure:
The structures of the respective cationic form (C+), zwitter ion (Z) and the anionic form (A-) are:
The acid-base equilibria for alanine involving the anion and the zwitter ion forms is:
(c)
Interpretation:
The pH at the isoelectric point needs to be calculated
Concept introduction:
- Amino acids are organic compounds composed of C, H, N and O. The two main functional groups include the amino −NH2 and carboxyl −COOH group in addition to a side chain each with a characteristic pKa value.
- Isoelectric point (pI) is the pH at which the net charge on the amino acid is zero. For amino acid with one −COOH and one −NH2, the pI is given as:
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Answer to Problem 30QAP
pH = 6.02
Explanation of Solution
For alanine at the isoelectric point:
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Chapter 23 Solutions
Bundle: Chemistry: Principles and Reactions, 8th, Loose-Leaf + OWLv2, 1 term (6 months) Printed Access Card
- Could you please solve the first problem in this way and present it similarly but color-coded or step by step so I can understand it better? Thank you!arrow_forwardCould you please solve the first problem in this way and present it similarly but (color-coded) and step by step so I can understand it better? Thank you! I want to see what they are doingarrow_forwardCan you please help mne with this problem. Im a visual person, so can you redraw it, potentislly color code and then as well explain it. I know im given CO2 use that to explain to me, as well as maybe give me a second example just to clarify even more with drawings (visuals) and explanations.arrow_forward
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- Calculate activation energy (Ea) from the following kinetic data: Temp (oC) Time (s) 23.0 180. 32.1 131 40.0 101 51.8 86.0 choices: 0.0269 kJ/mole 2610 kJ/mole 27.6 kJ/mole 0.215 kJ/mole 20.8 kJ/molearrow_forwardCalculate activation energy (Ea) from the following kinetic data: Temp (oC) Time (s) 23.0 180. 32.1 131 40.0 101 51.8 86.0arrow_forwardDon't used hand raiting and don't used Ai solutionarrow_forward
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