Question

Calculate the pH of the following acid–base buffers. Be sure to state and justify any assumptions you make in solving the problems. a. 100.0 mL of 0.025 M formic acid and 0.015 M sodium formate b. 50.00 mL of 0.12 M NH3 and 3.50 mL of 1.0 M HCl c. 5.00 g of Na2CO3 and 5.00 g of NaHCO3 diluted to 0.100 L 4. (10 Points) Calculate the pH of the buffers in problem 3 after adding 5.0 mL of 0.10 M HCl. Be sure to state and justify any assumptions you make in solving the problems. 5. (10 points) Calculate the pH of the buffers in problem 3 after adding 5.0 mL of 0.10 M NaOH. Be sure to state and justify any assumptions you make in solving the problems. I found that the pH of problem 3a is 3.53 and the pKa is 3.75. For 3b I found the pH to be 9.10 and the pKa of HCL to be 9.24. For problem 3c I found the pH to be 10.22 and the pKa to be 10.3. Hopefully you can use this info to find 4) and 5).

Answer 1

QUESTION 3A

QUESTION 3B

QUESTION 3C

QUESTION 4

QUESTION 5

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