:: Home Page            
 Advertise your Business Here     
Browse  |   Placement Papers  |   Company  |   Code Snippets  |   Certifications  |   Visa Questions
Post Question  |   Post Answer  |   My Panel  |   Search  |   Articles  |   Topics  |   ERRORS new
   Refer this Site  Refer This Site to Your Friends  Site Map  Bookmark this Site  Set it as your HomePage  Contact Us     Login  |  Sign Up                      
Categories >> Sciences >> Chemistry >> Analytical Chemistry


 Organic Chemistry interview questions  Organic Chemistry Interview Questions (222)
 Inorganic Chemistry interview questions  Inorganic Chemistry Interview Questions (96)
 Analytical Chemistry interview questions  Analytical Chemistry Interview Questions (850)
 Physical Chemistry interview questions  Physical Chemistry Interview Questions (57)
 General Chemistry interview questions  General Chemistry Interview Questions (283)
 Chemistry AllOther interview questions  Chemistry AllOther Interview Questions (71)
What is diffrence between residue on ignition and sulphated 
 Question Submitted By :: Analytical-Chemistry
I also faced this Question!!     Answer Posted By  
# 1
residue on ignition means the residue that left over on
ignition , the residue may be of any kind i.e sulphate, or
TiO2 or some other metal contamination.

Sulphated ash means the ash should be of the sulphate
Is This Answer Correct ?    119 Yes 17 No
# 2
Residue on Ignition is also known as total Ash.

Diluted sulphuric acid added to the total ash and again
ignited, the residue left behind is the sulphated ash.
Is This Answer Correct ?    57 Yes 16 No
Analytical Chemist
# 3
residue on ignition means sample is ignited at high
temperature and the remaining is the ash.
Sulphated ash means in the above ash add conc.sulphuric acid
and again ignite at high temperature.
Is This Answer Correct ?    26 Yes 6 No
# 4
Both are same
Residue on ignition as per USP
Sulphated ash as per EP
Is This Answer Correct ?    26 Yes 19 No
# 5
USP and Pheur (EP) have harmonized the methods. USP
accepts EP method as equivalent. Basically they are the
same tests.
Is This Answer Correct ?    17 Yes 13 No
# 6
In Residue of Ignition,the sample is ignited at high
temperatures as such,while in Sulphated Ash,sulphuric acid
is used before igniting the sample.
Is This Answer Correct ?    22 Yes 19 No
# 7
Residue on ignition means the sample is ignited at higher
temperature in the muffle furnace for the period of time.
If it is not converted as a complete ash(grey colour)add
dilute sulphuric acid to the residue and evaporate the
acidic solution again keep into the furnace to convert ash
is called sulphated ash.
Is This Answer Correct ?    3 Yes 0 No
# 8
When a sample is ignited to ash as such this is called residue on ignition as the meaning itself tells us., while the sulphated ash is certain samples need to be charred with sulphuric acid before ignition and the residue contains sulphates which is called sulphated ash. Eventhough USP and BP says the samething this is product specific.

Thanks and regards
Is This Answer Correct ?    3 Yes 0 No
# 9
Residual on ignition mesure only present metal in inert
atm.not convert in oxide.
Residual on ignition mesure present of metal oxide in
normal atm.
Sulphated ash mesure only present of metal oxide. using
sulphuric acid.
Is This Answer Correct ?    2 Yes 0 No
Chandrakant Padodara
# 10
sulphated ash is the ash of sulphates & residue on
ignition is the residue of sulphates,oxides and TiO2
content or some other heavy metals.
Is This Answer Correct ?    1 Yes 0 No
Ravindra Surdikar

Other Analytical Chemistry Interview Questions
  Question Asked @ Answers
why should we do limit of stray light in UV calibration and why should use potassium chloride   2
who is the father of HPLC? IPCA 1
why water factor is near about 5.0 in kf titration? Claris-Lifesciences 3
how to correct peak when peak comes broader in shape? How to do calibration of HPLC? Mankind 1
How you can calculate pKa ? Dr-Reddys 6
when we use pda detector in hplc instead of uv detector   6
In capadity factor formula is K'= (RT of main compound/RT of first eluted peak)-1 in this formula what is 1 Piramal-Healthcare 1
What is difference between Chromatographic purity and Related substances analysis?   2
What is the formula for Tapdensity / Dr-Reddys 6
From where 16 or 5.545 is derived in theoretical plates calculation formula by USP or JP/BP/DAB and what is meaning of this coefficient and impact in calculation ? Nectar-Lifesciences 2
what is the meaning of PURITY AND POTENCY .what is the difference between PURITY and POTENCY Orchid 5
what is mean by profiling of dissolution   1
For more Analytical Chemistry Interview Questions Click Here 

Copyright Policy  |  Terms of Service  |  Articles  |  Site Map  |  RSS Site Map  |  Contact Us
Copyright 2013  All Rights Reserved.   ::