ALLInterview.com :: 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                      
Google
   
 
Categories >> Sciences >> Chemistry >> Analytical Chemistry
 
 


 

 
 Organic Chemistry interview questions  Organic Chemistry Interview Questions (228)
 Inorganic Chemistry interview questions  Inorganic Chemistry Interview Questions (96)
 Analytical Chemistry interview questions  Analytical Chemistry Interview Questions (867)
 Physical Chemistry interview questions  Physical Chemistry Interview Questions (57)
 General Chemistry interview questions  General Chemistry Interview Questions (284)
 Chemistry AllOther interview questions  Chemistry AllOther Interview Questions (71)
Question
What is diffrence between residue on ignition and sulphated 
ash?
 Question Submitted By :: Analytical-Chemistry
I also faced this Question!!     Answer Posted By  
 
Answer
# 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
counterpart
 
Is This Answer Correct ?    123 Yes 18 No
R.sanjeeverayan
 
Answer
# 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
 
 
 
Answer
# 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 ?    28 Yes 6 No
Gaurav
 
Answer
# 4
Both are same
Residue on ignition as per USP
Sulphated ash as per EP
 
Is This Answer Correct ?    31 Yes 19 No
Mani
 
Answer
# 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 ?    18 Yes 14 No
Neenie
 
Answer
# 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
G.hamsa
 
Answer
# 7
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 ?    3 Yes 0 No
Chandrakant Padodara
 
Answer
# 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
Sivakumar.a
 
Answer
# 9
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 1 No
Suresh
 
Answer
# 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
 
what is poarimeter, why it is used in pharma,and explain briefly about polarimeter? GVK 2
why we want incorporate area of each solution of Intermediate precision and repeatability as well as Accuracy ? What is the use to incorporate area of each solution of Intermediate precision and repeatability as well as Accuracy ?   1
HOw do i calculate the number of theoretical plate on a HPLC chromatography   2
HOW CAN V CALIBRATE FTIR ? PLZ EXPLAIN ME Cipla 2
What is descriminatory disolution medium ? Cipla 2
Why we show ammonia vapours to tlc plate?to which compounds?   1
what is the difference between heavy metals and sulphated ash Aurobindo 2
how calibrate the hplc detector Cipla 1
why there is a need of optical activity & specific optical activity measurement by polarimeter Cadila 6
Retention time & Relative Retention time Definition & between difference? How to Calculate response factor(RF) & relative response factor(RRF)? MSN-Pharma 3
what is protocol ? plz Explain me   5
why we use only vanilline , acetanilide,& caffeine For the Calibration of melting point appartus? Reddy-Labs 5
 
For more Analytical Chemistry Interview Questions Click Here 
 
 
 
 
 


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

ALLInterview.com   ::  KalAajKal.com