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5. You are...
Showing work, please answer questions a and b, thank you! You are asked to prepare a...
Showing work, please answer questions a and b, thank
you!
You are asked to prepare a pH 8.60 buffer starting from 500 mL of 0.10 M solution of hydrocyanic acid, HCN, and excess sodium cyanide, NaCN. (Ka for HCN 4.9 x 10) 18. What is the pH of the hydrocyanic acid solution prior to adding NaCN? a) b) How many grams of NaCN should be added to prepare the buffer solution?
please show all of your work for parts b and c! thank you :) Your boss...
please show all of your work for parts b and c! thank you :) Your boss is studying a pepsin homolog present in fruit and asks you to make 1.00 L of a 0.100 M acetate buffer at pH 4.45. You have powdered sodium acetate and glacial (melting point 17 °C) acetic acid (also distilled water and all the usual lab equipment) available. When finalizing your answer, think about how best to measure the various components of the buffer. Note...
Please show all work as need and circle the correct answer. Thanks 6. Maleic acid is...
Please show all work as need
and circle the correct answer. Thanks
6. Maleic acid is a diprotic organic acid with the structure shown below. A titration curve was generated when 75.0 mL of a 0.0125 M maleic acid solution was titrated with NaOH. HOOC COOH PH maleic acid o 80 20 40 60 Volume of NaOH (mL) A. (6 pts) What was the approximate concentration of the NaOH solution? B. (3 pts) What is the approximate pka of maleic...
PRE-LABORATORY QUESTIONS Fully answer these questions in your laboratory notebook before coming to lab. Show all...
PRE-LABORATORY QUESTIONS Fully answer these questions in your laboratory notebook before coming to lab. Show all work for numerical calculations. 1. Write out the chemical equation and equilibrium constant expression (Law of Mass Action) for the acetic acid / acetate ion buffer system. Derive the Henderson-Hasselbach equation for this system. 2. Calculate the pH of a buffer solution made by adding 1.3230 g of sodium acetate trihydrate (NaC,H,O, 3H,O) to 50.00 mL of 0.1652 M acetic acid. Assume there is...
please answer the questions thank you Name: Lab Section: Date: Experiment VII: Buffers Review Questions (23...
please answer the questions thank you
Name: Lab Section: Date: Experiment VII: Buffers Review Questions (23 pts) 1. (3 pts). A solution is prepared by mixing 25.0 mL 0.45 M NaCH,coo and 30.0 mL 0.38 M CH,COOH is prepared. Calculate the pH of this solution if the K, 1.76 x 10 for acetic acid. 2. (3 pts)How many grams of sodium lactate, NaCsHsOs, should be added to 1.00 L of 0.150 M lactic acid, HCsHsOs, to form a buffer solution...
show all work for a and b please Question 2: Polyprotic acids: a) equivalents of NaOH...
show all work for a and b please
Question 2: Polyprotic acids: a) equivalents of NaOH added on the X axis. Use the pka values 2.2, 6.8 and 12.4 for the 3 Draw the titration curve for the titration of H3POs with NaOH. Put pH on the Y axis and ionizations b) how many moles of NaOH must you add to 1.00L of a 0.500M solution of H,PO, to make a pH = 6.5 buffer Draw an X on your...
Hi, please can you show me how to work 5a) and 5b) out. The Ka value...
Hi, please can you show me how to work 5a) and 5b) out. The Ka
value is 1,8*10^-5. Thank you.
eai 5. A buffer solution was prepared by adding 4.95 g of sodium acetate, NaCH,Co, to 250 cm'of 0.150 M acetic acid, CH COOH. Ka ,s S (a) What is the pH of the buffer? (b) What is the pH of 100 ml of buffer solution if you add 82 mg of NaOH to the solution? 1201
please show steps. i know its not 7.60 or 7.31 You add 1 L of 100...
please show steps. i know its not 7.60 or 7.31
You add 1 L of 100 mM HCl to 1 L of 100 mM Tris buffer (initial pH = 7.60 and a pka of 8.10). What is the approximate final pH? Select one: a. The final pH would be 12.70 b. The final pH would be 2.30 c. The final pH would be 12.08 d. The final pH would be 7.60 e. The final pH would be 7.81 f. The...
Note: (show all your works and measure that you answer all questions from part A to...
Note: (show all your works and measure that you
answer all questions from part A to part B below.
Sorry for long questions, but I give thanks to anyone who can help
me)
a. What is the pH of a buffer made by adding 10.00 mL of a 3.2 M HCOOH (aq) to 15.00 mL of a 3.2 M NaCOOH (aq) solution? pKa 3.74 b. What is the pH of a buffer made by dissolving 3.2 g of sodium acetate...
Can You Please Answer #4 With The Correct Multiple Choice Letter? 4. (2 pts) Which of...
Can You Please Answer #4 With The Correct Multiple Choice
Letter?
4. (2 pts) Which of the following combinations of chemicals could be a buffer? a. HCl/NaCl b. HCI/NaOH c. HC2H302/NaC2H302 e. NaOH/NaC2H302
Showing work, please answer questions a and b, thank
you!
You are asked to prepare a pH 8.60 buffer starting from 500 mL of 0.10 M solution of hydrocyanic acid, HCN, and excess sodium cyanide, NaCN. (Ka for HCN 4.9 x 10) 18. What is the pH of the hydrocyanic acid solution prior to adding NaCN? a) b) How many grams of NaCN should be added to prepare the buffer solution?
Please show all work as need
and circle the correct answer. Thanks
6. Maleic acid is a diprotic organic acid with the structure shown below. A titration curve was generated when 75.0 mL of a 0.0125 M maleic acid solution was titrated with NaOH. HOOC COOH PH maleic acid o 80 20 40 60 Volume of NaOH (mL) A. (6 pts) What was the approximate concentration of the NaOH solution? B. (3 pts) What is the approximate pka of maleic...
PRE-LABORATORY QUESTIONS Fully answer these questions in your laboratory notebook before coming to lab. Show all work for numerical calculations. 1. Write out the chemical equation and equilibrium constant expression (Law of Mass Action) for the acetic acid / acetate ion buffer system. Derive the Henderson-Hasselbach equation for this system. 2. Calculate the pH of a buffer solution made by adding 1.3230 g of sodium acetate trihydrate (NaC,H,O, 3H,O) to 50.00 mL of 0.1652 M acetic acid. Assume there is...
please answer the questions thank you
Name: Lab Section: Date: Experiment VII: Buffers Review Questions (23 pts) 1. (3 pts). A solution is prepared by mixing 25.0 mL 0.45 M NaCH,coo and 30.0 mL 0.38 M CH,COOH is prepared. Calculate the pH of this solution if the K, 1.76 x 10 for acetic acid. 2. (3 pts)How many grams of sodium lactate, NaCsHsOs, should be added to 1.00 L of 0.150 M lactic acid, HCsHsOs, to form a buffer solution...
show all work for a and b please
Question 2: Polyprotic acids: a) equivalents of NaOH added on the X axis. Use the pka values 2.2, 6.8 and 12.4 for the 3 Draw the titration curve for the titration of H3POs with NaOH. Put pH on the Y axis and ionizations b) how many moles of NaOH must you add to 1.00L of a 0.500M solution of H,PO, to make a pH = 6.5 buffer Draw an X on your...
Hi, please can you show me how to work 5a) and 5b) out. The Ka
value is 1,8*10^-5. Thank you.
eai 5. A buffer solution was prepared by adding 4.95 g of sodium acetate, NaCH,Co, to 250 cm'of 0.150 M acetic acid, CH COOH. Ka ,s S (a) What is the pH of the buffer? (b) What is the pH of 100 ml of buffer solution if you add 82 mg of NaOH to the solution? 1201
please show steps. i know its not 7.60 or 7.31
You add 1 L of 100 mM HCl to 1 L of 100 mM Tris buffer (initial pH = 7.60 and a pka of 8.10). What is the approximate final pH? Select one: a. The final pH would be 12.70 b. The final pH would be 2.30 c. The final pH would be 12.08 d. The final pH would be 7.60 e. The final pH would be 7.81 f. The...
Note: (show all your works and measure that you
answer all questions from part A to part B below.
Sorry for long questions, but I give thanks to anyone who can help
me)
a. What is the pH of a buffer made by adding 10.00 mL of a 3.2 M HCOOH (aq) to 15.00 mL of a 3.2 M NaCOOH (aq) solution? pKa 3.74 b. What is the pH of a buffer made by dissolving 3.2 g of sodium acetate...
Can You Please Answer #4 With The Correct Multiple Choice
Letter?
4. (2 pts) Which of the following combinations of chemicals could be a buffer? a. HCl/NaCl b. HCI/NaOH c. HC2H302/NaC2H302 e. NaOH/NaC2H302
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