what is the purpose of Buffer in any titration?Ex:In
determination of hardness of water we use ammonia
ammoniachloride buffer in titration with EDTA.Why?

Answers were Sorted based on User's Feedback

Answer / tushar

buffer is used to maintain ph of respective solution.

Is This Answer Correct ?    185 Yes 18 No

Answer / rahul jain

during the complexometric titration using EDTA, it is very necessary to maintain the pH of the solution near about 10.so we use ammonia ammoniumchloride buffer.if we will not use this buffer, during the titration pH of solution will go lower side(acidic side).

Is This Answer Correct ?    158 Yes 20 No

Answer / suresh

Buffer is a substance it will little resist change in the
pH of the solution.

In Hardness estimation the major substances in water is
Calcium carbonate and magnesium carbonate. The ammonia and
ammonium chloride buffer pH is 10. At the particular pH it
will form the complex with both calcium and magnesium.So
the titre value gives the total hardness of the solution.
If you want to measure calcium alone instead of adding pH
10 buffer add pH 12 buffer (1M NaoH).

Is This Answer Correct ?    71 Yes 7 No

Answer / dr. sanjay rana

It is necessary to Control the pH of Titration medium in
complexometric titration becoz, The complex form in this
titration is stable at more pH.(more than -6) and if pH
change the result will also change.

Is This Answer Correct ?    53 Yes 14 No

Answer / akbari syed

buffer is usually added to maintain the pH of the solution.

Is This Answer Correct ?    32 Yes 1 No

Answer / arhama

buffer solution resist change in PH.

Is This Answer Correct ?    20 Yes 4 No

Answer / vikash singh(up college

we use high buffer solution to mantain the pH of the solution medium bacause if we not use it then the pH of the solution decreases and the stability of  the chelating complex decreases. 

Is This Answer Correct ?    10 Yes 2 No

Answer / john

To maintain  ph level

Is This Answer Correct ?    9 Yes 6 No

Answer / gulendra kumar

The role of buffer soution in complexometric titration is to adjust the PH to ensure that the reaction goes to completion .

Is This Answer Correct ?    4 Yes 2 No

Answer / bhagyashree

During reaction between metal and EDTA, H+ ions are formed & decreases the pH of reaction mixture. Hence, a buffer solution of pH 10 is necessary during titration for Ca++ & Mg++ so that it will not allow the decrease of pH.

Is This Answer Correct ?    0 Yes 0 No

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