. Tryptamine (C₁₀H₁₂N₂) is a stimulant found in chocolate. Its molecular structure is shown below. The associated graph shows the % of the basic form of tryptamine as a function of pH. Estimate the pKₐ of the conjugate acid of this substance.**Molecular Structure:**- A structural formula is displayed, showing the arrangement of atoms in tryptamine, including an indole ring attached to an ethylamine group.**Graph Description:**- The graph is a titration curve plotting pH against the percentage of the basic form of tryptamine (α = %A⁻).- The y-axis represents the percentage of the basic form, ranging from 0% to 100%.- The x-axis represents pH, ranging from 7 to 14.- The curve starts at a low percentage in acidic conditions and increases sharply around a pH of 9, plateauing near 100% at higher pH levels.**Question:**Estimate the pKₐ of the conjugate acid of this substance. Choose from the following options:a. 5.0 b. 3.8 c. 9.0 d. 10.2 Select an answer and submit. For keyboard navigation, use the up/down arrow keys to select an answer.

Answer:Buffer solution is a type of solution that resists the change in its pH on adding small quantity of acid or base. Solution of weak acid and its conjugate base can act like a buffer solution.Suupose weak acid is HA then its conjugate base would be A- and reaction for the ionization of the weak acid is shown below:At 50% ionization, half of the acid will be dissociated and concentration of weak acid and its conjugate will be same, so,From, Henderson-Hasslebalch equation, pH of the buffer solution is:It means at 50% ionization, pH of the acid solution is equal to pKa and on observing the pH graph, it is clear that at 50% ionization, pH of the solution is 10.2, so,

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Tryptamine (C10H12N₂) is a stimulant found in chocolate. Its molecular structure is shown below. The associated graph shows the % of the basic form of tryptamine as a function of pH. Estimate the pka of the conjugate acid of this substance. a b с 5.0 3.8 9.0 d 10.2 100 α = %A 75 V 50 25 8 9 10 Select an answer and submit. For keyboard navigation, use the up/down arrow keys to select an answer. 0 HN 7 NH2 pH 11 12 13 14

Tryptamine (C10H12N₂) is a stimulant found in chocolate. Its molecular structure is shown below. The associated graph shows the % of the basic form of tryptamine as a function of pH. Estimate the pka of the conjugate acid of this substance. a b с 5.0 3.8 9.0 d 10.2 100 α = %A 75 V 50 25 8 9 10 Select an answer and submit. For keyboard navigation, use the up/down arrow keys to select an answer. 0 HN 7 NH2 pH 11 12 13 14

Chemistry

10th Edition

ISBN:9781305957404

Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Chapter1: Chemical Foundations

Section: Chapter Questions

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Question

Tryptamine (C₁₀H₁₂N₂) is a stimulant found in chocolate. Its molecular structure is shown below. The associated graph shows the % of the basic form of tryptamine as a function of pH. Estimate the pKₐ of the conjugate acid of this substance.

**Molecular Structure:**
- A structural formula is displayed, showing the arrangement of atoms in tryptamine, including an indole ring attached to an ethylamine group.

**Graph Description:**
- The graph is a titration curve plotting pH against the percentage of the basic form of tryptamine (α = %A⁻).
- The y-axis represents the percentage of the basic form, ranging from 0% to 100%.
- The x-axis represents pH, ranging from 7 to 14.
- The curve starts at a low percentage in acidic conditions and increases sharply around a pH of 9, plateauing near 100% at higher pH levels.

**Question:**
Estimate the pKₐ of the conjugate acid of this substance. Choose from the following options:

a. 5.0
b. 3.8
c. 9.0
d. 10.2

Select an answer and submit. For keyboard navigation, use the up/down arrow keys to select an answer.

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