What is the predominant form of pyruvic acid (pKa =2.50) and lactic acid (pKa = 3.86)...
What is the predominant form of pyruvic acid (pKa =2.50) and lactic acid (pKa = 3.86) at physiological pH (7.4)? Draw the predominant structure of each.
In which amino acid does the R group bond to the amino group?
Homework Answers
When pH=pKa you have an equal amount of the protonated and deprotonated forms of the acids, when pH>pKa the predominant form is the deprotonated one, while at pH<pKa the predominant form is the protonated one, so:
The only amino acid in which a part of the R group is bonded to the amino group is proline:
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What is the predominant form of pyruvic acid (pKa
=2.50) and lactic acid (pKa = 3.86)...
Consider the amino acid lysine: a. At physiological pH (pH = 7.4), what is the predominant...
Consider the amino acid lysine: a. At physiological pH (pH = 7.4), what is the predominant form in solution? b. What percent of the side chain group is ionized at this pH? c. What percent of the carboxylic acid group is ionized at this pH?
1. The amino acid structures as shown in lecture are the predominant forms at physiological pH...
1. The amino acid structures as shown in lecture are the predominant forms at physiological pH (7.4). a. Draw the predominant form of valine when the pH = 7.4 b. Draw the predominant form of valine when the pH = 1.0 c. Draw the predominant form of valine when the pH = 12.0 d. What is the total charge of the predominant form of valine when the pH = 7.4? e. What is the total charge of the predominant form...
Given stocks of 1 M Lactic Acid (pKa 3.86) at pH 3.5, 2 M naOH, 2...
Given stocks of 1 M Lactic Acid (pKa 3.86) at pH 3.5, 2 M naOH, 2 M HCl and water: how would you prepare 4 liters of 0.05 M Lactic Acid at pH 3.25? Give 2 M Tris, pH 7.1 (pKa 8.0), 5 M NaOH, 5 M HCl, and water: how would you prepare 2 L of 0.2 M Tris, pH 7.4?
A. Calculate the pH of a solution containing 0.2M lactic acid (pKa = 3.86) B. Calculate...
A. Calculate the pH of a solution containing 0.2M lactic acid (pKa = 3.86) B. Calculate the pH of a solution of 1x10^-9 M HCl (strong acid) in distilled water. Show your work.
1. a. For the following groups, indicate their predominant ionic species (draw the chemical structure) at...
1. a. For the following groups, indicate their predominant ionic species (draw the chemical structure) at pH 7.4: a. The side chain amino group (–NH3+) of the amino acid lysine, pKa=10.5. The side chain carboxyl group (-COOH) of the amino acid glutamate, pKa=4.1. b.For a buffer with a pKa of 8.03 : How will the pH and buffering capacity change when HCl is added to the buffer in “a”? How will the pH and buffering capacity change when NaOH is...
Consider a 8×10−2 M solution of the weak acid lactic acid , for which pKa = 3.86 ....
Consider a 8×10−2 M solution of the weak acid lactic acid , for which pKa = 3.86 . 1. Calculate the concentration of lactate ions. 2. Calculate the concentration of lactic acid in equilibrium.
A buffer contains 0.010 mol of lactic acid (pKa = 3.86) and 0.050 mol of sodium...
A buffer contains 0.010 mol of lactic acid (pKa = 3.86) and 0.050 mol of sodium lactate per liter. (a) Calculate the pH of the buffer. (b) Calculate the change in pH when 5.0 mL of 0.50 M HCl is added to 1.0 L of the buffer. (c) What pH change would you expect if you added the same quantity of HCl to 1.0 L of pure water?
10 ml containing 1.0 mmole of lactic acid solution, CH3CH(OH)COOH, (pKa=3.86) was titrated with NaOH solution...
10 ml containing 1.0 mmole of lactic acid solution, CH3CH(OH)COOH, (pKa=3.86) was titrated with NaOH solution up to a total volume of 100 ml a. what is the concentration of the base solution required for a full neutralization of the lactic acid? b. what is the pH at the equivalent point? c. what will be the pH of the solution obtained after adding 0.2 mmole of NaOH(S) (SOLID!)
A buffer contains 0.020 mol of lactic acid (pKa = 3.86) and 0.100 mol sodium lactate...
A buffer contains 0.020 mol of lactic acid (pKa = 3.86) and 0.100 mol sodium lactate per liter of aqueous solution. a. Calculate the pH of this buffer. b. Calculate the pH after 8.0 mL of 1.00 M NaOH is added to 1 liter of the buffer (assume the total volume will be 1008 mL).
Aspartic acid has three pKa values, 2.09, 3.86 and 9.82. a. On the following structure for...
Aspartic acid has three pKa values, 2.09, 3.86 and 9.82. a. On the following structure for this amino acid circle the protons that can be removed and indicate the corresponding pKa value? b. Determine the value of the isoelectric point for this amino acid. c. Sketch the structure of the zwitterion. d. If electrophoresis is carried out at pH is 7.0, will this amino acid migrate to the anode(+) or cathode(-).
1. The amino acid structures as shown in lecture are the predominant forms at physiological pH (7.4). a. Draw the predominant form of valine when the pH = 7.4 b. Draw the predominant form of valine when the pH = 1.0 c. Draw the predominant form of valine when the pH = 12.0 d. What is the total charge of the predominant form of valine when the pH = 7.4? e. What is the total charge of the predominant form...
Given stocks of 1 M Lactic Acid (pKa 3.86) at pH 3.5, 2 M naOH, 2 M HCl and water: how would you prepare 4 liters of 0.05 M Lactic Acid at pH 3.25? Give 2 M Tris, pH 7.1 (pKa 8.0), 5 M NaOH, 5 M HCl, and water: how would you prepare 2 L of 0.2 M Tris, pH 7.4?
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