Consider a buffer made by adding 132.8 g of NaC-H5O, to 300.0 mL of 1.97 M HC-H.O, (Ka = 6.3 x 10-5)   a. What is the pH of this buffer?   b. What is the pH of the buffer after 0.750 mol of H+ has been added?   c. What is the pH of the buffer after 0.250 mol of OH- has been added?

A. What is the pH of a buffer solution that is composed of 50.0 mL of a 0.25M weak base, Phyllis amine (Ph-NH2) combined with 75.0 mL of 0.23 its salt Phyllis chloride (PHCI)? pKb = 4.65 %3D B. Calculate the new pH of this buffer when 0.301 grams of solid sodium hydroxide is added to the solution. Assume there is no change in volume (MM sodium hydroxide 40.00 g/mol) Show all work on a separate sheet and upload your work. Write your answers in the spaces below: A. The pH of this buffer %3D B. The new pH %3D

.H. Park 19. A buffer solution is made from 0.100 M HC3H5O2 and 0.100 M NaC3H5O2. The pKa of HC3H5O2 is 4.88. a. Calculate the pH of the solution. b. Calculate the pH after 0.0250 mol of HCl(g) is added to 500.0 mL of the buffer.

Consider a buffer made by adding 132.8 g of NaC₇H₅O₂ to 300.0 mL of 2.35 M HC₇H₅O₂ (Ka = 6.3 x 10⁻⁵) a What is the pH of this buffer?     b What is the pH of the buffer after 0.750 mol of H⁺ have been added?     c What is the pH of the buffer after 0.250 mol of OH⁻ have been added?

5

5

5. Calculate the pH of a Buffer of Lactic Acid (HC2H502) 0.12M and Potassium Lactate (KC2H502) 0.11M. The Ka = 1.4x10-4

5. a. Suppose a solution contains 0.50 M NaH2PO4 and 0.80 M Na2HPO4. What pH should be expected for this buffer solution? Uw we made aw bufter b. Calculate the final pH if 5.0 mL of 0.10 M NAOH is added to 20.0 mL of this buffer solution. it +corected