In Force degradation Study Compound is not degrade in any condition , also in higher stress what can i do ?4 6145
4. Describe the operation of the Craig apparatus. Chapter.3 Equilibrium Processes in Separations1311
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.904
what type of question will ask in the interview of lab chemist.2132
Why we show ammonia vapours to tlc plate?to which compounds?1 3989
what is the purge flow & how to calculate1205
what is mean by 21 CFR PART? In that what is 21 ?1 9688
is there any exact definition for Theoritical plates ? chennu srinivas5 6380
What is the use of tailing factor ?2 10762
what is the relation of normality & molarity ? give me formula?5 9514
In C8,C18....etc have 4&5 etc... microns Columns is there like that how to separate Chiral columns as per Micron size?1 3914
What is the diff b/n OVI and Residual solvents1 4653
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]
Why perchloric acid used for potentiometric titration
What is viod volume and peak purity in HPLC?
While performing TOC sst analysis Zero shift disabled & sample analysis zero shift enabled why?
Identify problem faced when mass spectroscopy is used with HPLC system ?
how to select short coloum and long coloumn for new molecule
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
WHAT IS THE CRITERIA FOR SELECTION OF TIME OF DISSOLUTION AND THE MEDIUM OF DISSOLUTION?
Basic principle of ESI?
We use Potassium Dichromate solution for the calibration of UV-Visible Spectrophotometer in UV region. My question is to calibrate visible region which solution could be used in photometric accuracy
Why potassium dichromate is used in calibration of uv?
How to start the dissolution development for unknown tab?
How can the GC or HPLC method is selected to determine the impurity profile in drug product?
What is the difference between purge septum flow and column flow in gas chromatography?
what is the purge flow & how to calculate