In order to avoid the pyridine catalyst use in many synthesis which is harmfull to environment, which catalyst can be used....?

1920

we shall use Dichloromethane in last stage of API.

2616

why cone formation during dissolution?

310

how to prepare the 0.001M tio2

1883

How to choose the which salt is suitable for mobilephase

2637

Explain why acetic has less conductivity than hcl?

581

Why we have to add 200mg Na2CO3 in preparation of 0.1N sodium thiosulfate solution?

1124

Why sodium hydroxide used for maintain pH of phosphate buffer

1820

what is the principle involved in turbidometry and nephelometry ?

3626

Do all explosions produce carbon dioxide or carbon monoxide?

612

Polymer chain growth can be terminated by b-hydride elimination or by reaction with h2. What is one advantage of the h2 reaction? : Polymer Chemistry

672

Explain the secondary structure of proteins?

543

What is the difference between volumetric solutions and test solutions

2558

Describe the role of Protactinium in neutron sources and its significance for research in nuclear physics.

116

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

1104