[43 points) Preparation of buffer solution and identification of unknown buffer solution Part I: Determination of K of t

[answerhappygod]

43 Points Preparation Of Buffer Solution And Identification Of Unknown Buffer Solution Part I Determination Of K Of T 1 (40.54 KiB) Viewed 80 times

43 Points Preparation Of Buffer Solution And Identification Of Unknown Buffer Solution Part I Determination Of K Of T 2 (44.39 KiB) Viewed 80 times

43 Points Preparation Of Buffer Solution And Identification Of Unknown Buffer Solution Part I Determination Of K Of T 3 (48.5 KiB) Viewed 80 times

[43 points) Preparation of buffer solution and identification of unknown buffer solution Part I: Determination of K of the buffer solution Solution pH Initial After After adding 2 adding 2 ml mL HCI NaOH Distilled 7.1 2.2 12.5 water Unknown 4.38 3.8 4.9 buffer Use the table above and the data given in the manual to determine the following: pH of the unknown buffer solution (given in the table above) = Calculated (HA) in the volumetric flask = If the [A-] was found to be 0.44M. What is the pKa value of the unknown buffer? pKa = Ka = ►
Part II: Identification of unknown buffer solution Compare the calculated Ka value with the values given in the manual and identify the unknown buffer solution. The unknown buffer is: OH COz/NaHCO3 C6H5COOH/C.HCOONa OHCOOH/HCOONa OH3PO4/NaH2PO4 OHCOOHCOOH/HOOCCOONa Based on the buffer you have identified in the previous step, the molar mass of the salt used to prepare this buffer is: This unknown buffer is considered as • buffer, according to its pH. This buffer consists of and salt of its conjugate When HCl is added to the buffer solution, which component of the buffer will react with the H30+ added? The pH value of the buffer decreases slightly after adding 2 mL of HCI
Buffer Preparation: There are several ways to prepare a buffer solution of a specific pH. One method is mentioned in the manual. The other way is mentioned below but not in a correct order. 1. Once the pH is adjusted to the desired pH, dilute the solution to the final desired volume. 2. Measure the pH of the solution using a pH meter. 3. Adjust the pH to the desired value using a strong base or acid like NaOH or HCI. 4. Prepare a solution with an acid and its conjugate base by dissolving them in about 50% of the volume of water required to obtain the final solution volume. What is the correct order of preparing the buffer solution: O1,3,4,2 2,3,1,4 4,1,2,1 4,2,3,1