Analytical Chemistry Interview Questions
Questions Answers Views Company eMail

IN pH CALIBRATION,CALIBRATION IS DONE FOR pH METER OR ELECTRODE?HOW WILL YOU JUDGE THAT THE METER TO BE CALIBRATED WITH 4,7,9.2 BUFFERS?EXPLAIN TEMPERATURE EFFECTS ON pH.

Aurobindo,

1 8227

AT WHAT CONDITIONS WILL YOU ANALYSE A SAMPLE,WHICH ARE PRESERVED AT OTHER THAN THE AMBIENT CONDITIONS?(ie COLD STORAGE SAMPLES BELOW 20* CENTIGRADE?

828

What is a base line?

2 7941




what is differance between density and specificgravaty

Neuland,

2 8169

what is defferance between dipolemoment and polarity

Neuland,

1 5582

In standard weight box used for calibration of analytical balance there are two numbers (Qty) of 20mg, 200mg,2.oGM weights. Why?

Orchid,

2 10622

WHAT IS USE OF ION PAIR REAGENTS?

3 6283

How to calculate signal to noise ratio by this formula 2H/h where h from where and how to measure

1 6034




How to choose the which salt is suitable for mobilephase

Ranbaxy, Cipla,

1653

What is quality controle.

6 7167

What is Standard deviation

Cipla,

2 8235

When you get Moisture content by KF higher than by LOD, what does this indicate?

6 10290

what is deference b/w the working standard and reference standard

3 16824

How do we fix the sample concentaryion in hplc method development. what is the basis?Thanks in advance

Orchid, Glenmark, DRL,

3 12344

Suppose we prepared pH buffer solution in lab.and calibrate against NIST solution, and same shall going to used upto 30 days. is it possible to stable pH and apperance ? suggest ?

Orchid,

1 3937


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Un-Answered Questions { Analytical Chemistry }

what is the principle involved in turbidometry and nephelometry ?

2373


we are performed SOR for a particular product the limit is -6 to -10.We face particular bathes it is not meeting the specification.we performed diffrent instrument diffrent analyst we are getting diffrent diffrent results.solvent is dimethyl sulfoxide what could be the reasion

455


In GC calibration,what is the procedure to calibrate the TCD (thermal counductivity detector)suggest ?

1913


Difference between hlaf and rlaf

673


why octanol used to determine the partition coefficient ?

952






1.What is the difference between method validation and method verification 2.Which guidelines proposed to method transfer

212


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

554


How to choose concentration of LOQ solutions for RS analysis? Example.

732


Ratio of Water and Acetonitrile(diluent) is not recommended to use in cleaning method validation,why?

1647


what is the disso medium for tropsiun chloride

882


What is FFA, PV, and PAV value in oil.

554


Colorimtry

205


Why Ethanol is Used for Standardization of GC Head space?

2595


How can I develope method of dissolution by HPLC OR UV

954


How to start the dissolution development for unknown tab?

287