4. Tris has a pK~7 but is sold as the base. Thus 10 ml of a...
4. Tris has a pK~7 but is sold as the base. Thus 10 ml of a 1 M solution of Tris base out of the bottle will have a pH near 11. If you add 1 M HCl to this solution 1 ml at a time: a) the pH would initially change rapidly, then slow, then change rapidly again b) the pH would initially change slowly, then rapidly, then change slowly again c) the pH would change slowly and then rapidly (its HCl) d) the pH would change at the same rate with each ml of HCl added as in titration
Homework Answers
Titration of a Weak Base Prelaboratory Questions 1. Will addition of HCl to a solution make...
Titration of a Weak Base Prelaboratory Questions 1. Will addition of HCl to a solution make it more acidic or more basic? Will the pH increase or decrease? How does an end point differ from an equivalence point? 2. were titrated with a standard HCl solution: 3. Aliquots of an unknown tris sample Use the balanced equation to set up the string calculation showing how the tris a. mol of acid, L of acid. mo of base, and L of...
3. A common buffer used in working with DNA solutions is tris. tris a) Draw the...
3. A common buffer used in working with DNA solutions is tris. tris a) Draw the structure of the protonated form of tris. HO Но, b) When 30.00 mL of a 62.20 mM tris solution is titrated with 0.100 M HCl, the pH equals 7.40 after 3.96 mL of HCl are added. What is the PK of tris? c) (Optional, not counted) How would you prepare 500.0 mL of a 0.0100 M PH 7.4 tris buffer solution assuming you had...
4.48 The weak base colloquially known as Tris, and more precisely as tris(hydroxymethyl)aminomethane, has pK, = 8.3...
4.48 The weak base colloquially known as Tris, and more precisely as tris(hydroxymethyl)aminomethane, has pK, = 8.3 at 20°C and is commonly used to produce a buffer for biochemical applications. (a) At what pH would you expect Tris to act as a buffer in a solution that has equal molar concentrations of Tris and its conjugate acid? (b) What is the pH after the addition of 3.3 mmol NaOH to 100 cm3 of a buffer solution with equal molar concentrations...
2. (32 points) Strychnine is a weak base with a pk of 5.74. A 150. mL...
2. (32 points) Strychnine is a weak base with a pk of 5.74. A 150. mL sample of 0.076 M strychnine solution is titrated using 0.060 M hydrochloric acid. What is the pH of the solution at the following points: a) No acid has been added. b) 25.00 mL of acid have been added. c) 100.00 mL of acid have been added. d) The midpoint of the titration. e) The equivalence point of the titration. 1) Sketch this titration curve,...
Titration of 25.00 mL of 0.100 M HCl with 0.100 M NaOH (strong acid, strong base):...
Titration of 25.00 mL of 0.100 M HCl with 0.100 M NaOH (strong acid, strong base): Answer the following questions: 4. Calculate the initial pH 5 Why is pH = 7 at the equivalence point? 6Why does the pH rise slowly at first, very rapidly near the equivalence point, and slowly after the equivalence point? 7. Why does it require 25.00 mL of NaOH to reach the equivalence point?
You are asked to make one litre of 0.2M Tris-CI buffer pH 8.8, using Tris base and IM hydrochlori...
You are asked to make one litre of 0.2M Tris-CI buffer pH 8.8, using Tris base and IM hydrochloric acid. a) given the MW of Tris is 121.1, how much Tris would you weigh out to make one litre of b) what is the ratio of [Tris base] to [Tris acid] in the final buffer solution? (pKa of Tris is c) what is the total concentration of Tris (i.e. Tris base form+Tris acid form) in the final 0.2M Tris-Cl buffer?...
Sera titrates a 10.00 mL sample of a 0.0750 M weak base (A4-) with 0.2500 M...
Sera titrates a 10.00 mL sample of a 0.0750 M weak base (A4-) with 0.2500 M HCl, a strong monoprotic acid. The Kb values for this base are Kb1 = 2.00 x 10-3, Kb2 = 3.00 x 10-6, Kb3 = 4.00 x 10-9, and Kb4 = 5.00 x 10-11. Calculate the volume of HCL, in mL, needed to reach the first equivalence point of this titration. Calculate the pH of the titration solution after 4.50 mL of HCl has been...
The pK) values for the dibasic base B are pKb1 = 2.10 and pKb2 = 7.57....
The pK) values for the dibasic base B are pKb1 = 2.10 and pKb2 = 7.57. Calculate the pH at each of the points in the titration of 50.0 mL of a 0.60 M B(aq) solution with 0.60 M HCl(aq). What is the pH before addition of any HCI? pH What is the pH after addition of 25.0 mL HCI? pH = What is the pH after addition of 50.0 mL HCI? What is the pH after addition of 75.0...
If you mixed 50 mL of 0.1 M TRIS acid with 60 mL of 0.2 M...
If you mixed 50 mL of 0.1 M TRIS acid with 60 mL of 0.2 M TRIS base, the resulting pH is 8.67. How many total mL of 1 M NaOH could you add to the solution and still have a good buffer (i.e. within one pH unit of the pKa which equals 8.3)?
The PK) values for the dibasic base B are pKb1 = 2.10 and pKb2 = 7.88....
The PK) values for the dibasic base B are pKb1 = 2.10 and pKb2 = 7.88. Calculate the pH at each of the points in the titration of 50.0 mL of a 0.60 M B(aq) solution with 0.60 M HCl(aq). What is the pH before addition of any HCI? pH = What is the pH after addition of 25.0 mL HCI? pH = What is the pH after addition of 50.0 mL HCI? pH = What is the pH after...
Titration of a Weak Base Prelaboratory Questions 1. Will addition of HCl to a solution make it more acidic or more basic? Will the pH increase or decrease? How does an end point differ from an equivalence point? 2. were titrated with a standard HCl solution: 3. Aliquots of an unknown tris sample Use the balanced equation to set up the string calculation showing how the tris a. mol of acid, L of acid. mo of base, and L of...
3. A common buffer used in working with DNA solutions is tris. tris a) Draw the structure of the protonated form of tris. HO Но, b) When 30.00 mL of a 62.20 mM tris solution is titrated with 0.100 M HCl, the pH equals 7.40 after 3.96 mL of HCl are added. What is the PK of tris? c) (Optional, not counted) How would you prepare 500.0 mL of a 0.0100 M PH 7.4 tris buffer solution assuming you had...
4.48 The weak base colloquially known as Tris, and more precisely as tris(hydroxymethyl)aminomethane, has pK, = 8.3 at 20°C and is commonly used to produce a buffer for biochemical applications. (a) At what pH would you expect Tris to act as a buffer in a solution that has equal molar concentrations of Tris and its conjugate acid? (b) What is the pH after the addition of 3.3 mmol NaOH to 100 cm3 of a buffer solution with equal molar concentrations...
2. (32 points) Strychnine is a weak base with a pk of 5.74. A 150. mL sample of 0.076 M strychnine solution is titrated using 0.060 M hydrochloric acid. What is the pH of the solution at the following points: a) No acid has been added. b) 25.00 mL of acid have been added. c) 100.00 mL of acid have been added. d) The midpoint of the titration. e) The equivalence point of the titration. 1) Sketch this titration curve,...
Titration of 25.00 mL of 0.100 M HCl with 0.100 M NaOH (strong acid, strong base): Answer the following questions: 4. Calculate the initial pH 5 Why is pH = 7 at the equivalence point? 6Why does the pH rise slowly at first, very rapidly near the equivalence point, and slowly after the equivalence point? 7. Why does it require 25.00 mL of NaOH to reach the equivalence point?
You are asked to make one litre of 0.2M Tris-CI buffer pH 8.8, using Tris base and IM hydrochloric acid. a) given the MW of Tris is 121.1, how much Tris would you weigh out to make one litre of b) what is the ratio of [Tris base] to [Tris acid] in the final buffer solution? (pKa of Tris is c) what is the total concentration of Tris (i.e. Tris base form+Tris acid form) in the final 0.2M Tris-Cl buffer?...
The pK) values for the dibasic base B are pKb1 = 2.10 and pKb2 = 7.57. Calculate the pH at each of the points in the titration of 50.0 mL of a 0.60 M B(aq) solution with 0.60 M HCl(aq). What is the pH before addition of any HCI? pH What is the pH after addition of 25.0 mL HCI? pH = What is the pH after addition of 50.0 mL HCI? What is the pH after addition of 75.0...
The PK) values for the dibasic base B are pKb1 = 2.10 and pKb2 = 7.88. Calculate the pH at each of the points in the titration of 50.0 mL of a 0.60 M B(aq) solution with 0.60 M HCl(aq). What is the pH before addition of any HCI? pH = What is the pH after addition of 25.0 mL HCI? pH = What is the pH after addition of 50.0 mL HCI? pH = What is the pH after...
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