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Categories >> Sciences >> Chemistry >> Analytical Chemistry


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What is primary & Secondary Standard ? Give Example
 Question Submitted By :: Analytical-Chemistry
I also faced this Question!!     Answer Posted By  
# 1
Primary standard :
Primary standards are the materials having high purity
values under specified conditions which can be used to
standardise the volumetric solutions.This primary stadards
also used to prepare the solutions which are necessay for
the calibration of analytical instruments.

Secondary standards:
Generally volumetric solutions are
known as secondary standards
Is This Answer Correct ?    111 Yes 31 No
# 2
Primary standard are the compounds having reagent(analyte)
of high purity and can directly used for perpration of
standard solutions.
Example:- Nacl is primary standard for AgNO3
NaOH is primary standard for HCl

Secondary Standard solutions are analysed against primary
standard solutions. Basically these are perpared in
laboratory for specific analysis.
Is This Answer Correct ?    15 Yes 5 No
Kamal Kishore Kashyap
# 3
For example in pharmaceutical chemistry primary standard will be pharmacopoeia's standard - USP or CRS, but they are very expensive. So you can fully characterize your "in house" material as your primary standard and use it for analysis. All next batch of standard, characterized vs. primary will be secondary standard. A part of primary standard should be stored for secondary standards characterizations. 
Is This Answer Correct ?    23 Yes 23 No
# 4
primary std thats stdrd solution can be prepare but secondry thats stdnrd solution can not be prepared

eg. acetic acid is primary std but sulfuric acid is secondry
Is This Answer Correct ?    3 Yes 6 No
Nisha (college Student)
# 5
Primary standard :
the Primary standards are the NIST ,ISO ASC Standard
tracible materials
.This primary stadards
the solutions which are use for
the calibration of analytical instruments.
also used to standardization of std( Normal & Molar solution

Secondary standards:
are use to routine analysis known as
secondary standards for but Secondary standards are liquid
calibration of analytical instruments.
also used to standardization of std( Normal & Molar solution
Is This Answer Correct ?    36 Yes 54 No
Kishanpal Singh Fare Labs Gurg

Other Analytical Chemistry Interview Questions
  Question Asked @ Answers
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why reference flow required during hplc analysis on rid?   1
what is batch no. of prednisole tablet.   6
how PH an important role in HPLC separation   2
why do we have to used saturated ammonia in TLC cipla 2
What is difference between Chromatographic purity and Related substances analysis?   2
What is (Q) point dissolution? Macleods 5
what is the difference between capillary and glass column in GC   1
acceptance criteria for ph meter, hplc detector,pump,injector,oven when we calibrate.   3
what is peak purity ?? Cipla 7
why we use only six bowls for dissolution of a drug Natco 1
For more Analytical Chemistry Interview Questions Click Here 

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