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 6247

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]

1474

sop of a uv visible spectrophotometer double beam elico model

Sun Pharma,

4123




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

Matrix,

4 7960

How will you select mobile phase in HPLC Method Development

3 13521

how to regulate noise in hplc ?

2 6683

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

2 6131

why base line not start from zoro in GC Chromatograme.

Merck,

1 5967




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

5 6692

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

7 15664

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

1 5226

how do u optimise hplc method

1 5501

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

ACME, Vimta Labs,

1 5797

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

Dr Reddys,

5 97582

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

Cadila, IIT,

8 20314


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Un-Answered Questions { Analytical Chemistry }

what is procedure of actual procedure for registration of drug?

608


Why acetonitrile and water are used as extraction solvent when analysis melamine? I thought they are miscible and won't be able to separate...

226


what is the importence and role of LCMS and LCMS/MS and their applications? which type of compounds are analysis by lcms?

2278


if you have given a blank water how you analyse by general analytical techniques?

701


iam usig ph buffers merk. manually how to prepare ?

970






What is intact assay method development.....?

1102


how can I make the copper get white bye any salt or acit?

967


2. Two grams of Benzoic acid are dissolved in 200 ml of water and extracted with 200 ml of diethyl ether. The distribution coefficient of benzoic acid is 100, and its dissociation constant is 6.5 10-5. Calculate the distribution ratio (D) of benzoic acid at pH 2, 5, and 6. 3. Calculate D at pH 2 to 10 (1 unit apart) in the above problem, and plot D versus pH.

862


What is the principle of HPLC, GC, LCMS, GCMS,LC QQQ, GC QQQ, LC Q TOF and GC Q TOF. What are the applications and Specificity?

5730


what type of question will ask in the interview of lab chemist.

2078


4. Describe the operation of the Craig apparatus. Chapter.3 Equilibrium Processes in Separations

1258


For titration in anhydrous media with perchloric acide, if lack of titrator, Which indicator is been used for replacement. How calculate pH of test solution to choose suitable indicator?

859


function of detecter in hplc ,gc and spectroscopy? function of carrier gas in gc?

1187


How to start the dissolution development for unknown tab?

287


My question about gas chromatography sulfur chemiluminsecence detector. I test unknown sample gas by GC-SCD (calibrated ) and the result of *H2S is 279 PPM , *but when I test the same sample with the GC-TCD (calibrated ) the value of *H2S is 2500 PPM . I'd like to inform you that both GCs are calibrated and have very good operation conditions with stable parameters . the question is if the sample gas with higher H2S over detection limits of SCD detector (1000 ppm). why the result it 279 ppm Best regards

179