Analytical Chemistry Interview Questions
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In BP2013, Loperamid HCl monograph. Assay by titration with 0.1N sodium hydroxide using hydrocloric acid 0.01N and reading the volume added between the 2 points of inflexion. I have a question that if the diluent solvent is ethanol is certainly consumed a amount of volume of titrant, so this volume must be eliminated on the result calculation or not apart from first point which is subtracted above.

1550

If i performing one analysis on C8column then the same analysis done on C18 column then what will happen about Rt;Resulution;Peak shape Explain ?

1 5359

what is peak purity? how may types of methods to determine peak purity?

Mylan,

3 9749




why using Potentometry What Purpose? differance between manual and potentiometry? why using Some of materials in usig potentiometry? What is use of mericuric acetate in Potentiometry

Biocon,

1 2898

iam using ph instrument lab india make.3ponit and 5point.in calibration time 3point slope will come 98.89and 96.87.that limit is 85 to 105.what basis slope will come.any calucalation between them.5point wiicome slope 99.89?why 3p0int came 2 values

1 2936

iam usig ph buffers merk. manually how to prepare ?

934

Sulphated Ash incresed it will effect on product yield?

Biocon, Lupin,

1 2070

in loss on drying Why follows on constant weight not more than 0.5 mg, any region

Biocon,

1 8633




difference between selectivity and specificity

Troikaa Pharmaceuticals,

2 9736

when we talk about change in entropy we consider total entropy means of surround +entropy of system but when we talk about change in Gibss free energy we consider entropy of system.explain with reason.

ABC,

734

differnc btw c18 and c-8 column

Cipla,

3 9180

use of stry light

1 4705

when we have polar type of sample and solvnt hen which type of stationry phase we have to use

3 4109

what is motor rotation in case of sucrose

1 1676

why equlirium conatant of water have 14 value

GVK Biosciences,

872


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Un-Answered Questions { Analytical Chemistry }

How can we confirm the HPLC column is end-capped or not? Is it possible to identify by physical appearance?

1778


IS THERE ANY EQUIPMENT TO CHECK AND CALCULATE THE POLARITY OF A LIQUID?

1185


What is control room temperature and which guide line says?

285


what is definition of validation? which components are followed give detail?

841


why we do the calibration of limit of stry light in hplc & uv

1342






how to select short coloum and long coloumn for new molecule

952


What is the principle of Thermal conductivity detector and FID?

1353


could negative ions be produced by bombardment process in mass spectrometry?

134


What is the calibration of uv process and preparation

619


why does used dry caffien in HPLC calibration?

528


can we use the same detector in HPLC as well GC and what could be the differences we can find in the final chromato graph in any aspects?

860


How can we calculate "confidence interval" in analytical method validation? Pl. explain with example.

2360


How they found 1mL of K.F reagent is equivalent to 5mg of water and if we change the composition of K.F reagent, is it can neutralize more amount of water?

268


what are the standard methods for HPLC?

1445


how to calibrate hplc & gc

3053