Analytical Chemistry Interview Questions
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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 8102

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

795

What is a base line?

2 7815




what is differance between density and specificgravaty

Neuland,

2 8028

what is defferance between dipolemoment and polarity

Neuland,

1 5493

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

Orchid,

2 10406

WHAT IS USE OF ION PAIR REAGENTS?

3 6168

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

1 5909




How to choose the which salt is suitable for mobilephase

Ranbaxy, Cipla,

1617

What is quality controle.

6 7047

What is Standard deviation

Cipla,

2 8089

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

6 10093

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

3 16110

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

Orchid,

3 12062

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 3891


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Un-Answered Questions { Analytical Chemistry }

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.

824


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

150


What is column in chromatography?

750


What is aggregate and fragments in SEC?

582


what is lod and loq ?,why use k2cr2o7 , kcl h2so4 in uv calibration ?,why use benzophenone & caffene acetone in hplc calibration ?,what is leading peak in hplc ?why we do the calibration of limit of stry light in hplc & uv ?

2030






what is turbidimetric titration?Give 2 examples.

1002


some product having water content method with pyridine and ethylene glycol mixture instead of methanol? how they are selecting and methanol is not suitable solvent how ?

1105


WHAT IS THE CRITERIA FOR SELECTION OF TIME OF DISSOLUTION AND THE MEDIUM OF DISSOLUTION?

1317


what is the different in Total ash, sulphated ash, acid insoluble ash, alcoholic or non alcoholic ash?

6766


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

795


For limit test of heavy metals in BP, Method C require that the substance is ignited at a temperature not exceeding 800 °C. Why confines such the temperature?

2273


how can give the expiry period and restadardisation of volumetric solution

1246


why lactose has less charges when packed in steel containers when compared with packing of lactose in polyamide material?

906


what is DIPE limit in residual solvent?

446


what is procedure of actual procedure for registration of drug?

570