Question

I don't understand what calculations I would have made to create the buffer solution from Part D of the lab. I understood the procedures I took to create the solution but when the report asks to show the calculations used to prepare the buffer solution I am not sure other than mixing the volumes indicated in the procedures section.

Thank you

pH of Butter Assigned by Instructor 5.12. Measured pH of Assigned B r .9 (Read the procedural Show the reading on the meter to your instructor, and obtain her initiats) . Show the calculations you used and detail the steps you followed to prepare this buffer solution including the volumes of al solutions used: 6 prepare the butter soution: sep 1: Combined 1.500g Chiknown acid with 100. OMLD1 nater. Dissored completely. 2. Measured at 550 online atid sol o berar labelled HA, - Measund out 5000 m funnon acid coln to bearer labelled A added a drops indicator, 3: Better A- was titrated tent pont veing poolt 4 Beaker HA we added equal amount of DI water as was used to hithate beaker At. - Transfered 2sone & HA+01H,o to 150ml beaker called so.no buffer mixture 5 Combined 25.0mL of Beaker A +Nooh son to so 50 Buler Mixture on • Compare the pH change of the buffer prepared above to that of delonized water upon the addition of a strong base by recording the following values: Delonized Water Buffer Solution pH before adding NaOH: pH after adding 5 drops of NaOH: pH change: • Briefly explain why the buffer is more resistant to a change of pH upon addition of the base than the water. Use equations to support your explanation: The butter is more resistent to the addition of base than water as the addition q a base gerorales more CH3COONa ny reaching with CH2.2004 whereas, there is no such change in the case of water. • Why isn't the measured pH of the deionized water before adding the NaOH(aq) equal to 7.07 DI water is not pure water, it has contact with atmospheric carbon dioxide to form carbonic acid : H₂Out CO₂ → H₂CO3 (09). Carbonic acid is acidic by nature, so its pH is less than 7, so DI water will PH Measurement and its Applications: Report also be avail as a result and rule apH Page 4 of 4 less than 7,

Answer 1

Sol:

For basic/alkaline buffer, the relation between its concentration and pH is:

pH pKa-log [salt] / [base pH pKalog base] /[salt]

Here, Ka= Ionisation constant of conjugate acid of the base.