You have available the following reagents as 0.10 M aqueous solutions: NaOH,HCl,phenol (pK_a = 9.89),aniline (pK_b = 9.37),HNO₂ (pK_a = 3.37),CH₃NH₂ (pK_b = 3.44).Which two reagents would you use to make a buffer with a pH of 10.5?

Question

Quizplus · Accepted Answer

CH₃NH₂ is a weak base with a pKₐ of 10.56 (calculated from pK_b = 3.44), close to the desired pH of 10.5. Adding HCl will partially protonate CH₃NH₂, forming a buffer system.

You Have Available the Following Reagents as 0