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what is main use of primary standards in caliration
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Answer / satish
Primary standards more accuracy and weighing error is negligible and unaltered in air
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Answer / manisha
It is extremely pure,stable. It does not hydrated that's why it is used for calibration
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plz tall me that any pharmacopeia and guideline is par meted to use 1.68,4.01,7.00,9.00,12.45 buffer for ph meter calibration
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Organic Chemistry 
