Grading Rubric – Weak Acids and Buffers Initial0.00 4.29 Bufferingcapacity reached (where pH is) 7.585.29 Equivalence point8.859.57 8.(3 pts)Based on the volume of NaOH added in Step 9 of the Data Analysis, determine the buffering capacity of the buffered acetic acid solution. You may disregard the volume of “1 L” from the definition and refer to the volume used of the original buffer. Be sure to include the correct units.
9.(6 pts)At volumesbelowthe volume determined in Step 9 of the Data Analysis, discuss the relative changes in pH following subsequent NaOH additions. What happened to the pH following subsequent additions of NaOHafterthe Step 9 volume was reached? Why? Include the titration curve and second derivative curve from thePart BData Analysis. --At volumes below the volume of . 00758 L NaOH determined in Step 9 of the Data Analysis, the relative changes in pH following subsequent NaOH additions were extremely small. The pH would from . 010 to .40 units, opposed to an entire unit of pH.This is due to the fact that any 7 A. M. BohnsackFall 2018 (revised Z. Baranová)Figure 7:Figure 8:Thesecond derivative curve for the titration of acetic acid and NaOH titration.
