Question

26. What is the effective range of a buffer? 27. Give a brief description of the proper way to fill a buret with a solution. Tuslom b 28. What is the purpose ofa buffer?

Answer 1

26) The effective range of a buffer is the P^{​​​​​​H} range between which a buffer can effectively mantian constant PH of a solution or effectively resists to change in the P​​​​​H of the soution by addition of small amount of acid or base. Generally effective range will be +/-1 of PKa of buffer. Eg PKa of buffer is 8 then effective PH range will be 7 to 9.

27) fix the burette to stand place a small beaker below the burette and put funnel top of the burette open the tap of the burette add the small amount of solution and allow the solution into beaker then close the tap of burette. Then add solution in to the burette 1 or 2 mL excess and then remove the funnel. Adjust the solution volume to lower miniscus on 1mL mark.

28) The purpose of a buffer is to maintain the constant PH of the soution even if small amount of acid or base is added. Since some reactions takes place at certain PH so we have to maintain the Constant PH.