Analytical Chemistry Interview Questions
Questions Answers Views Company eMail

what is the moisture content of Disodium hydrogen tartrate. how it can be calculted. as 16.5%

1 6007

In Karl Fischer titration,What is the situation if the material tested is only soluble in water,and not soluble in the common solvents used such as methanol ?? [e.g. Iron III Hydroxide polymaltose]

1390

sop of a uv visible spectrophotometer double beam elico model

Sun Pharma,

4027




why does the result variation in hplc and gc with same sample ?

Matrix,

4 7703

How will you select mobile phase in HPLC Method Development

3 13223

how to regulate noise in hplc ?

2 6400

why results are variation in same samples analysis in gc and hplc ?

2 5956

why base line not start from zoro in GC Chromatograme.

Merck,

1 5724




What is cleaning validation of rinse and swabe and its limit with caculation formula.

5 6423

what is the difference between c-8 and c-18 column

7 14950

why deutiriated chloroform used in NMR for sample prepration. what reaction takes place.give reasons

1 5082

how do u optimise hplc method

1 5357

How to calculate %w/w and %v/v of a component(or solvent)by NMR

ACME, Vimta Labs,

1 5604

How to prepare 10% HCl from 36.5% HCl solution.

Dr Reddys,

5 92686

How to prepare 50 ppm ammonia solution form 25% ammonia solution?

Cadila, IIT,

8 19486


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Un-Answered Questions { Analytical Chemistry }

What is importance of pH in the Heavy metal test and How it effect on the test results?

863


which one is better separation in high pressure liquide chromatogram orlowpressure chromato gram in hplc

858


What is the acceptance criteria for moisture balance when calibrated with sodium sulfate

591


how can delete the impurity in 1-(2:6 dichloro phenyl)-2-indolenone.and desolving the impurity in which solvent but does not desolve product in solvent.

1101


What is the difference between known and unknown impurities?

154






How to compare XRD graphs against standard and carry polymorpism study of API's by powder XRD method?

2485


What is the purpose of octyl silane columns?

2423


what is difference between UV - VISIBLE MODEL NO like 1600,1601,1700 etc ? plz explain me

1094


How to determine the EDTA content by potentiometry titration in Ceftriaxine sodium

1007


is it necessary to do HPLC calibration at wavelength 315nm if we are doing analysis at this wavelangth

486


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

1159


In HPLC (Waters) software Empower1,2 &3 what is the updation for each version

1305


In Karl Fischer titration,What is the situation if the material tested is only soluble in water,and not soluble in the common solvents used such as methanol ?? [e.g. Iron III Hydroxide polymaltose]

1390


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

824


what is the purge flow & how to calculate

1095