vipul suryavanshi


{ City } mumbai
< Country > india
* Profession * pharmaceutical r & d
User No # 120751
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Total Answers Posted # 3

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Questions / { vipul suryavanshi }
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What is the pH of water?

Zydus Cadila,

1 Analytical Chemistry 2868

Why we use buffers Acetate for pH 4.5 & phosphate for 6.8 and not vice-versa?

Zydus Cadila,

1 Analytical Chemistry 2511



Answers / { vipul suryavanshi }

Question { Anthem, 5240 }

What is the use of ELSD in HPLC?


Answer

ELS Detector is bulk property detector, it is mostly used for molecules, such as sugars, peptides which are UV inactive. Detection based on light scattering by dry analyte, degree of scattering determines concentration with the help of Photomultiplier tubes.

Is This Answer Correct ?    1 Yes 0 No

Question { Zydus Cadila, 2868 }

What is the pH of water?


Answer

It's not 7, because of dissolved gases like CO2 and O2. It ranges from 6.2 to 6.8

Is This Answer Correct ?    3 Yes 0 No


Question { Zydus Cadila, 2511 }

Why we use buffers Acetate for pH 4.5 & phosphate for 6.8 and not vice-versa?


Answer

Buffers are stable in their specific pH range (+/- 1unit from their pKa value). Buffer capacity

Is This Answer Correct ?    1 Yes 0 No