Please, show work.
•How many moles of HCOOH (pKa = 3.86) and NaHCOO are required to make 1 L of 0.5M formate buffer at pH = 4?
•How many moles of HCOOH and NaOH are required to make 1 L of 0.5M formate buffer at pH = 4?
•How many moles of NaHCOO and HCl are required to make 1 L of 0.5M formate buffer at pH = 4?
Please, show work. •How many moles of HCOOH (pKa = 3.86) and NaHCOO are required to...
A chemist prepared an aqueous buffer containing both formic acid (HCOOH) and the formate anion. The volume of the buffer is 100 mL ; with [HCOOH] = 0.110 mol L-1 and [HCOO- ] = 0.101 mol L-1 . The pKa of HCOOH = 3.74. What is the pH of this buffer? Write down the balanced chemical equation that describes the reaction of this buffer when an HCl solution is added. c) What is the resultant pH of this solution after...
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?
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...
For a particular formic acid buffer (pKa of HCOOH is 3.74), the ratio of CHOO- to CHOOHr at pH 4.25 was 3.236. If you have 100 mL of the buffer and the total ion concentration (CHOOH and CHOO-) is 0.20 M, how many moles of NaCHOO do you need to add to raise the pH to 4.71?
Please show all work as needed and provide correct multiple choice answer. Thanks 5. You are preparing a buffer of pH = 8.95 for an experiment. Your lab partner has already added 0.0455 moles of HBrO to a flask containing 1.00 L of water. A. (8 pts) You need to add some NaBrO to finish the buffer preparation. How many moles of NaBrO are required? Assume that the volume of the solution won't change when you add the solid. pK...
-e-laboratory Assignment Name: ead the experiment and answer the following questions as directed by your instructor A student is performing a titration. Diagrams of the buret at the beginning and the end of the titration are shown at right. To the correct number of significant figures, what is the initial volume, the final volume, and the volume of solution added during the titration? 16 2) Formic acid (HCOOH) is a weak acid with K. - 1.8 x 10-4. a) Write...
3. Histidine buffer revisit - How many moles of HCl are necessary to change the pH of 0.20 M histidine buffer, 0.30 L, from an initial pH of 9.50 to a final pH of 2.40? Show your work to receive full credit for the exam. Assume that the addition of the HCI does not dramatically affect the final volume of the solution.
Using 4-(2-hydroxyethyl)-1-piperazineethanesulfonic acid (pKa = 7.56) and 1.00 M NaOH or 1.00 M HCl; prepare 0.250 L of 0.050 0 M buffer at pH 7.45. How many mL of the acid or the base is required?
How many grams of sodium formate, NaCHO2, would have to be dissolved in 3.0 L of 0.12 M formic acid (pKa 3.74) to make the solution a buffer for pH 5.30?
Which of the following compounds would make the best buffer at pH 7.5? Acetic acid, pKa= 4.76 N-tris(hydroxymethyl) methylglycine (Tricine), pKa = 8.15 N-2-hydroxyethylpiperazine-N’-ethansulfonic acid, pKa2= 7.6 Glycine, pKa2= 9.9 Tris(hydroxymethyl)aminomethane (Tris), pKa = 8.3 I believe 3 is the correct answer and therefore I am trying to answer the below question with this information. Using the answer that you selected from question 1 above: a. Explain how you would make the buffer starting with 1M HA and 1M A-...