why we are used 4,7,9,2 buffers for the ph calibration

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why we are used 4,7,9,2 buffers for the ph calibration..

Answer / pharmainterview

Basic concept is you need to check in acidic,neutral and
basic range. By covering all these regions you can check
anyware.
As per usp the difference between two adjacent buffers
should not more than 4.

Regards
pharmainterviewquestions.blogspot.in

Is This Answer Correct ?    41 Yes 0 No

why we are used 4,7,9,2 buffers for the ph calibration..

Answer / amarsingh

Because by using this all pH buffer we can cover all range
of pH (Acidic , Neutral & Basic ) So we use this range

Is This Answer Correct ?    16 Yes 4 No

why we are used 4,7,9,2 buffers for the ph calibration..

Answer / pankaj shrivastava

Calibration points should cover required ph adjustment of
solution. if you use only 2 to 7 ph range for ph adjustment
then you can calibrate the ph with 2.4.7 ph.

Is This Answer Correct ?    2 Yes 1 No

why we are used 4,7,9,2 buffers for the ph calibration..

Answer / arash babakhanian

pH is determined from this equation in the pH meter

pH = [(Eobs-K)/0.059]n

Eobs= observed potential
K= constant paramere
0.059=slope

constant parameters k and 0.059 should be calibrated. In
fact two acidic buffers and two alkalic buffers are used to
fix slope and K constant . In this case, the relation
between Eobs and pH is analyticaly change

Is This Answer Correct ?    1 Yes 2 No

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