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Organic Chemistry (342) - Inorganic Chemistry (123)
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Why acetonitrile and water are used as extraction solvent when analysis melamine? I thought they are miscible and won't be able to separate...
1762In HPLC calibration, caffeine is used as primary standard for wave length calibration due to caffeine is having dual maxima at 273 & 205 nm and one minima at 245 nm. Any body can give reference of these details from any pharmacopeia (with chapter no.) or any other authentic guideline?
2019Does domestic/household used kerosene oil which is available in blue color (In India) can change its color over the due course of time say 8-10 years if keeping in plastic bottle? If so, in which color it will be turned to change, yellow or transparent or any other color. Please provide me the reply with strong technical approach. Since it has been asked during an interview. Please reply fast. I will be thankful to you if anyone can provide the supporting journals/write-ups/reference to favour of response.
14701.What is the difference between method validation and method verification 2.Which guidelines proposed to method transfer
1900My 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
1655
Observe the following number to four significant figures and express the result in standard exponential notation: 0.006543210?
effect of pore size, pore volume, partical size, column length, carbon load on retention time? what is carbon load? what is the use?
chlorination of methane is possible and a mixture of products are obtained. Is flourination and Bromination of methane is possible?
What is the hybridization at nitrogen?
What is the difference between cracking, pyrolysis, destructive distillation, hydroforming, carbonization and dry distillation?
why xterra column require to use at higher ph?
How to convert -40 of into centigrade?
What is the white precipitate produced at the end of point?
Protactinium has potential applications in nuclear reactors. Could you elaborate on its role in enhancing reactor efficiency or safety?
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
what is turbidimetric titration?Give 2 examples.
USP methodology, EP methodology, IP methodology, among three if possible to use one methodology for qualify working standard to use USP, EP, IP ? Please explain...
what are the role of chemical education in sustainable development
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?
A ha tc is actual defination of retention time?
