Mpre oonn n 4ini4 (ii) acidic buffer: it is the solution of a mixture of a weak acid and a salt of this weak acid with a strong basee for example:- ch,cooh+ ch,

Salt is formed by weak acid + strong base.

CH3COO-Na+. CH3COOH is weak acid & NaOH is strong base

please ask if you don't get anything

It is spliited in two parts...1st is (salt of weak acid + strong base) and 2nd is weak acid....Both these parts mixture is Acidic buffer....

now got this anand?

means to make acidic buffer i have to mix only Ch3cooh and NaoH

weak acid you take and salt of weak acid and strong base...only condition is this

im not getting it, salt will get prepared by mixing weak acid and strong base na

yes,see my attached image

means if I have let soln of HCL and i have to maintain its ph then by adding only Ch3cooh and Naoh to it, its ph will remain same na?

im i right?

first anand you have to make buffer solution then only na ph remains same...here first you have to take weak acid and strong base then salt is formed...then after mixture of formed salt and weak acid again...makes the acidic buffer

means its buffer soln for Ch3cooh , that is it won't allow to change its ph, or it is used to maintain ph of any other acid other than ch3cooh

what is its use im not getting

anand...just to maintain acidic environment acidic buffer is used and for maintaining basic environment alkaline buffer is used....

does it mean than if i have to make buffer for Ch3cooh to maintain its ph i have to do all above?

no just acidic buffer is made like this...and some ph of that buffer is noted...if we want to do reaction at this certain ph that there is no change in ph...we use this buffer

oohhkk

i have another que that, in laboratory their are already made soln of naoh , ch3cooh, koh, or many acidic and basic soln already preaped so do their acidity or basisity decrease day by day?

yes,anand when in laboratory some acid and bases are kept for longer tym then when you take obseravtion by using these chemicals then there is difference is exact value...so sometym you have read in book that freshly prepared solution are to be used

ohkk

if we made buffer soln then would they loss thier ph values after month?

or can we maintain that acidic condition for so long time as many years?

Not exact value you get as you are getting at the tym of preparation