siri


{ City } bangalore
< Country > india
* Profession *
User No # 48019
Total Questions Posted # 2
Total Answers Posted # 4

Total Answers Posted for My Questions # 14
Total Views for My Questions # 30025

Users Marked my Answers as Correct # 105
Users Marked my Answers as Wrong # 18
Questions / { siri }
Questions Answers Category Views Company eMail

If we are getting split peak in Chromatogram,what we can do?

 7 Analytical Chemistry 16306

Generally for Normal Phase HPLC,stationary phase is Polar.In place of polar if we take non-polar means what happened & why?

Macleods,

7 Analytical Chemistry 13719



Answers / { siri }

Question { Reddy Labs, 37643 }

How will you convert a 6 Normal solution to 8 Normal
solution?


Answer

We can't convert lower to higher normal solutions.If we want to convert from higher to lower means we can use N1V1=N2V2 dilution formula.

Is This Answer Correct ?    8 Yes 7 No

Question { Reddy Labs, 30079 }

why we use only vanilline , acetanilide,& caffeine For the
Calibration of melting point appartus?


Answer

These chemicals are very stable and covers
range between 0-300°c .Easily available in market .
vanilline - 81°C to 83°C
Acetanilide - 114°C to 116°C
Phenacetin - 134°C to 136°C
Sulfanilamide - 164.5°C to 166.5°C
Sulfapyridine - 191°C to 193°C
Caffeine - 234°C to 237°C

Is This Answer Correct ?    30 Yes 2 No


Question { Neuland, 31578 }

what does optical rotation and specific rotataion
means,difference between them


Answer

Specific Optical Rotation=(100*Optical Rotation)/(Cell Length in Decimeters*Concentration)
Here 1mm = 0.01 Decimeter

Is This Answer Correct ?    18 Yes 5 No

Question { Laurus, 18713 }

HOw do i calculate the number of theoretical plate on a HPLC
chromatography


Answer

We can use the following formula for calculation of the Theoretical plates(N).


N = 16*[TR/W]2

Here N = Theoretical plates
TR = Retention Time
W = Peak width

Is This Answer Correct ?    49 Yes 4 No