Answer Posted / k.aruna

Uracil,caffiene,benzophenone,erbium
perchlorate,anthracene,holmium oxide.

anthracene is used,because of sharp absorption bands&good
solution stability.

In which situation we require to prepare the standard solution from sample in Related substance method?

775

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What is rs test why we are performing rs test?

1856

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how to calibrate hplc & gc

4508

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for which product require to do content uniformity? what is limit of cu?

816

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Why only 1.2 million lux hours require in photostability study?

1031

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What is column in chromatography?

2235

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in DMF having extra impurities and in api COA also having extra imp than USP or BP product then how require to proceed?

833

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in monograph 7 imp are there but in vendor showing 5 imp do not req to include 2 imp for that what will be justification?

719

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how to selecet an exact coloumn for an new molecule development by hplc how to select exact salt as buffer for new molecule development by hplc what is the the process to select the mode of saparation of compoundes by hplc what is the use of ph of buffer what is use of buffer,ph,organic phase,ans methods how the molecules get saparated in coloumn,

2599

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Why only hydroxy naphthol blue indicator is used for standardisation of 0.05M EDTA solution instead of solochrome Black T or Euriochrome Black T indicator which is used for all sample analysis with 0.05M EDTA solution?

2719

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Why we select scan range from higer wavelength to lower wavelength in uv visible spectroscopy and ftir spectroscopy ? .

911

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In Assy by potentio metry titration method how select MET U ,DET U, SET U,

2165

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what is the difference between potentiometric titration and karl fischer titration?

3186

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What is the difference between chromatographic purity and related substances?

1366

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Home heating oil or furnace oil what is made from? Can (base oil plus diesel/kerosen) = home heating oil?

2182

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