Question

5. What is the pH of 250.0mL solution that is 0.0955 M HCH3CO2 (Ka=1.8x10-5) and 0.125 M NaCH3CO2. a. Now, 20.0 mL of 0.455 M HCl (aq) is added to the original buffer. i. Write the neutralization reaction (use the actual species in the reaction). ii. Find the moles of all species. iii. Build a stoichiometry table with the reaction and the data (or anything that shows what happens in the reaction). iv. What is your prediction for the pH change compared with the original buffer? Compared to the pKa? v. What is the pH of the solution? Was your prediction correct? vi. Do you still have a buffer? Why? b. What is the pH of the system if instead, 20.0mL of 0.455M Ca(OH)2(aq) is added to the original buffer? i. Do you still have a buffer? Why?

Answer 1