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Categories >> Sciences >> Chemistry >> Chemistry AllOther


 Organic Chemistry interview questions  Organic Chemistry Interview Questions (225)
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 Analytical Chemistry interview questions  Analytical Chemistry Interview Questions (856)
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 General Chemistry interview questions  General Chemistry Interview Questions (283)
 Chemistry AllOther interview questions  Chemistry AllOther Interview Questions (71)
Why only Water & Sodium Tatrate Is Use For THe Calibration  
Of Karl Fischer Titrator?
 Question Submitted By :: Chemistry-AllOther
I also faced this Question!!     Answer Posted By  
# 1
The karl Fishcer has to standardized to check the
concentration of it, i.e how many milli grams of water can
neutralize against ml of reagent(mg of water/ml of KF
Pure water can be used and disodium tartrate dihydrate also
can be used.

Weighing of water at mg leveliss is difficult(By using
modern analytical balances it is possible).

But if we take disodium tartrate dihydrate, we can weigh
good quantity of weight, as water is part of molecule.
Is This Answer Correct ?    83 Yes 22 No
Nagaraju Chittela
# 2
The Water and Disodium Tartarate is used for
standardisation of karl Fishcer,because we are checking
capacity of 1 ml of KF reagent to neutralise water.
Hence water content in std is very imp importan for this

i)Water is 100%.
ii)disodium tartrate dihydrate : This compound contain
15.66% of hydrate (water).
that is clear?
Is This Answer Correct ?    63 Yes 6 No
# 3
sodium tartarateis primary standard 
Is This Answer Correct ?    62 Yes 29 No
Satish Negi
# 4
i)Water is 100%.
ii)disodium tartrate dihydrate : This compound contain
15.66% of hydrate (water).
the content of water in the tartarate salt remains uniform
and constant at room temperature and avoids errors in the
solubility errors can also be avoided with both the
compounds used for standerdisation
Is This Answer Correct ?    28 Yes 5 No
Rajendra Bojanala
# 5
DST is primary standard and it is stable up to 150 degree
Centigrade. It release free water molecules easily when
reacts with KF reagent.DST is easily soluble in methanol.
This DST has 15.66% water molecules so we can easily
calculate and standardize the KF reagent. We use the factor
of DST the compound which has less than 1% of moisture.

Water i.e 100% water molecules. But we must use 100% pure
water there should absent dissolved salts and anymore. This
method is not 100% accurate like DST. So generally We use
the factor of water for the compound which has more than 1%
of moisture.1water molecule approximately equal to 5mg of KFR.
Is This Answer Correct ?    20 Yes 1 No
# 6
Water is 100% and disodium tartarate dihydrate contains 15.6% of water content,,,,whn check the % of water it should match with tht % (15.6%) is stable 
Is This Answer Correct ?    4 Yes 2 No
# 7
DST is a primary standard and MC is 15.66% constant and it
is freely disolve methanol remove water molecule.

water mc is 100% so both DST &water are used.
Is This Answer Correct ?    2 Yes 0 No
Murali Reddy
# 8
I)In DST Two water molecules are release 100% water
molecules thats why we using DST
Is This Answer Correct ?    9 Yes 8 No
# 9
the disodium tartarate dihydrate have two water molecules
and molecular weight 15.66% and water mc is 100%^
Is This Answer Correct ?    1 Yes 0 No
Mekala Naresh Raj
# 10
Di sodium tartrate di hydrate is having 15.66% and in the
process of di sodium tartrate di hydrate only water is used
as solvent(Other solvents are not used). then it contains
only water as moisture content.
Is This Answer Correct ?    8 Yes 8 No

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