Alanine (H2NCH(CH3) is a common amino acid that has a basic amino group. A) Write an...
Alanine (H2NCH(CH3) is a common amino acid that has a basic amino group.
A) Write an equilibrium for the reaction of alanine acting as a Bronsted base with a water molecule. (Ka of protonated amino group = 1.349 x 10 -10
B) Calculate the Kb of the amino group
C) Calculate the pOH of a 0.025M solution of alanine in water
D) Calculate the pH value of a 0.025M solution of alanine in water
E) Describe how the equilibrium would respond to a reduction in the concentration of OH
Homework Answers
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Alanine (H2NCH(CH3) is a common amino acid
that has a basic amino group.
A) Write an...
b: Before neutralization the solution (is acidic/is basic) and the (protonated amino group/deprotonated amino group/protonated ester...
b: Before neutralization the solution (is
acidic/is basic) and the (protonated amino group/deprotonated amino
group/protonated ester group) makes benzocaine soluble in the
aqueous solution. When the sodium carbonate is added, the (amino
group is deprotonated/amino group is protonated/ester group is
deprotonated) and the neutral benzocaine produced has a (low
solubility in water/high solubility in water/higher density than
water).
The local anesthetic, benzocaine, can be prepared by the direct esterification of p-aminobenzoic acid with ethanol, using sulfuric acid as the catalyst....
Activity #2 Calculate the pH of the following basic solutions. 1. Calculate the pH and pOH...
Activity #2 Calculate the pH of the following basic solutions. 1. Calculate the pH and pOH of a 0.200 M Ca(OH)2 2. Calculate the equilibrium concentrations for [OH-], [HB+), and [B], the pH and pOH for a 0.200 M pyridine solution. (CsH5N) Kb = 1.4 X 10-9 3. Calculate the equilibrium concentrations for [OH-], [HB], and [B], the pH and pOH for a 0.200 M methylamine. (CH3NH2) Kb = 4.4 X 10-4 4. Calculate the equilibrium concentrations for [OH-], [HB+],...
Instructions: Complete all the problems in this assignment Show all your work and submit a PDF...
Instructions: Complete all the problems in this assignment Show all your work and submit a PDF with your answers through Husky CT for your lab section. Please e-mail me if you have an issues with the submission. Activity #1 Calculate the pH for the following acidic solutions 1. Calculate the pH and pOH for the following solutions: a. 0.200 M HNO3 b. 0.200 M H2SO4 2. Calculate the equilibrium concentration for [H], [A-], and [HA], the pH and pOH for...
The sidechain thiol of the amino acid cysteine has a pKa value of 8.37. Ka=4.26E-9 Give...
The sidechain thiol of the amino acid cysteine has a pKa value of 8.37. Ka=4.26E-9 Give the standard free energy change for the sidechain acting as an acid at 30 degrees C. If the pH of the solution is 7.6, what is the [H3O+] in solution? If the pH of the solution is 9.8000000000, what fraction of deprotonated to protonated cysteine sidechains will exist in solution? What is the concentration of protonated cysteine sidechains if the pH of the solution...
1. Write the equilibrium expression for the autoionization of water. Using this expression define the terms...
1. Write the equilibrium expression for the autoionization of water. Using this expression define the terms acid and base and pH. 2. Calculate the pH, pOH, Ka, Kb, pKa, and pKb for a 0.082M solution of triethylamine. 3. Calculate the pH, pOH, Ka, Kb, pKa, and pKb for a 1.570 M solution of hydrogen cyanide. 4. The acid-dissociation constant for hypochlorus acid is 3.0 X 10-8. Calculate the concentrations of H3O+, CIO-, and HCIO at equilibrium if the initial concentration...
(3 points) A 0.0730 M solution of a monoprotic acid is 1.07% ionized. What is the...
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What is the pH of a 6.85 × 10−3 M weak acid solution, HA, if Ka...
What is the pH of a 6.85 × 10−3 M weak acid solution, HA, if Ka = 4.5 × 10−6? Group of answer choices 1.2 4.8 9.1 3.8 6.5 What is the pOH of 4.50 × 10−4M HBr? Group of answer choices 10.7 6.7 1.7 12.3 3.3 What is the pH of a 9.67 × 10−3M solution of NaOH? Group of answer choices 13.0 4.6 12.0 9.4 2.0 A 6.5 × 10-2 M solution of a weak acid, HA, has...
1) Write equations that show H2PO4− acting both as an acid and as a base. 2)...
1) Write equations that show H2PO4− acting both as an acid and as a base. 2) Calculate the pH and the pOH of each of the following solutions at 25 °C for which the substances ionize completely: (a) 0.200 M HCl (b) 0.0143 M NaOH (c) 3.0 M HNO3 (d) 0.0031 M Ca(OH)2 3)Propionic acid, C2H5CO2H (Ka = 1.34 × 10−5), is used in the manufacture of calcium propionate, a food preservative. What is the hydronium ion concentration in a...
chapter 16 question 15: 1. The pOH of an aqueous solution of 0.431 M acetylsalicylic acid...
chapter 16 question 15: 1. The pOH of an aqueous solution of 0.431 M acetylsalicylic acid (aspirin), HC9H7O4, is 2. The hydronium ion concentration of an aqueous solution of 0.43 M nitrous acid is [H3O+] = ____ M question 16: 1. The substance benzoic acid (C6H5COOH) is a weak acid (Ka = 6.3×10-5). What is the pH of a 0.114 M aqueous solution of potassium benzoate, KC6H5COO? 2. What is the pH of a 6.01×10-2 M aqueous solution of sodium...
3. i). Write the formula of four strong acids and four strong bases. ii). List four...
3. i). Write the formula of four strong acids and four strong bases. ii). List four factors that affect the strength of an acid. iii). Predict the relative strength of the following compounds: H2O, H2S and H2Se. iv). Which of the following is the stronger acids: CHCICOOH or CHCI-COOH? Explain. v). Al 3* is not a Bronsted acid, Al(H2O)" is. Explain. vi). All Bronsted acids are Lewis acids, but the reverse is not true. Give two examples of two Lewis...
b: Before neutralization the solution (is
acidic/is basic) and the (protonated amino group/deprotonated amino
group/protonated ester group) makes benzocaine soluble in the
aqueous solution. When the sodium carbonate is added, the (amino
group is deprotonated/amino group is protonated/ester group is
deprotonated) and the neutral benzocaine produced has a (low
solubility in water/high solubility in water/higher density than
water).
The local anesthetic, benzocaine, can be prepared by the direct esterification of p-aminobenzoic acid with ethanol, using sulfuric acid as the catalyst....
Activity #2 Calculate the pH of the following basic solutions. 1. Calculate the pH and pOH of a 0.200 M Ca(OH)2 2. Calculate the equilibrium concentrations for [OH-], [HB+), and [B], the pH and pOH for a 0.200 M pyridine solution. (CsH5N) Kb = 1.4 X 10-9 3. Calculate the equilibrium concentrations for [OH-], [HB], and [B], the pH and pOH for a 0.200 M methylamine. (CH3NH2) Kb = 4.4 X 10-4 4. Calculate the equilibrium concentrations for [OH-], [HB+],...
Instructions: Complete all the problems in this assignment Show all your work and submit a PDF with your answers through Husky CT for your lab section. Please e-mail me if you have an issues with the submission. Activity #1 Calculate the pH for the following acidic solutions 1. Calculate the pH and pOH for the following solutions: a. 0.200 M HNO3 b. 0.200 M H2SO4 2. Calculate the equilibrium concentration for [H], [A-], and [HA], the pH and pOH for...
1. Write the equilibrium expression for the autoionization of water. Using this expression define the terms acid and base and pH. 2. Calculate the pH, pOH, Ka, Kb, pKa, and pKb for a 0.082M solution of triethylamine. 3. Calculate the pH, pOH, Ka, Kb, pKa, and pKb for a 1.570 M solution of hydrogen cyanide. 4. The acid-dissociation constant for hypochlorus acid is 3.0 X 10-8. Calculate the concentrations of H3O+, CIO-, and HCIO at equilibrium if the initial concentration...
3. i). Write the formula of four strong acids and four strong bases. ii). List four factors that affect the strength of an acid. iii). Predict the relative strength of the following compounds: H2O, H2S and H2Se. iv). Which of the following is the stronger acids: CHCICOOH or CHCI-COOH? Explain. v). Al 3* is not a Bronsted acid, Al(H2O)" is. Explain. vi). All Bronsted acids are Lewis acids, but the reverse is not true. Give two examples of two Lewis...
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