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 8367

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]

1 2857

sop of a uv visible spectrophotometer double beam elico model

Sun Pharma,

5327

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

Matrix,

4 10895

How will you select mobile phase in HPLC Method Development

4 16807

how to regulate noise in hplc ?

2 8751

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

2 8294

why base line not start from zoro in GC Chromatograme.

Merck,

1 7800

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

5 10391

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

7 21653

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

1 6685

how do u optimise hplc method

1 6990

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

ACME, Vimta Labs,

1 8023

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

Dr Reddys,

5 119626

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

Cadila, IIT,

8 28045


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Un-Answered Questions { Analytical Chemistry }

in monograph 7 imp are there but in vendor showing 5 imp do not req to include 2 imp for that what will be justification?

244


can i use hplc detector to uplc and why?

1792


In which situation we require to prepare the standard solution from sample in Related substance method?

264


Did anybody have method for acetyl cysteine effervescnce tablet

1792


How to know the estimated LOQ concentration in ppm

706






why we use a particular hplc column for a particular compound give reasons?please

2248


how decide the clining method and cleaning method validation require for this perticular products?

277


why require to add enzymes in capsules dissolution only? is it require to tablet also?

240


Why only hydroxy naphthol blue indicator is used for standardisation of 0.05M EDTA solution instead of solochrome Black T or Euriochrome Black T indicator which is used for all sample analysis with 0.05M EDTA solution?

2174


how pda detector works over uv?

264


For standardization of volumetric solutions, acceptance limit for concentration is considered as 10% of nominal concentration and %RSD as NMT 0.2% (for appropriate no. of replicates). But , if %RSD has not met, what should be further action?

1215


how you fix the limits of impurities?

352


how to select short coloum and long coloumn for new molecule

1798


How to choose the which salt is suitable for mobilephase

2617


What is a difference between potency and purity?

612