Answer Posted / t.tirupathi rao

acetone is react with methanal to form water molecule continue, end point not reached.so pyridine is added to methanol, pyridine is bind the hydrogen molecule in methanol,so do not form the water molecule ,end point reached

could negative ions be produced by bombardment process in mass spectrometry?

1717

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how to set sample and standard concentration in RS method?

838

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how many types of balance calibration test?

2243

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Tell me something about Vitamin A test method by HPLC

2624

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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

1546

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why require the ph, buffer during hplc mobile phase?

813

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how will you do the prep for unstable componds?

1970

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Difference between hlaf and rlaf

2049

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How can we calculate offset value pH measurment

1460

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If vendor having more imp than monograph then how to proceed? and how to set spec?

843

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how require to fix the linearity and accuracy cincentration range?

1566

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How to calculate coreletion coefficient

1631

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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?

664

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when we talk about change in entropy we consider total entropy means of surround +entropy of system but when we talk about change in Gibss free energy we consider entropy of system.explain with reason.

1984

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WHAT IS THE PURPOSE WE USE HCL, CHOPPER, BURNER, MONOCHROMATOR in AAS? PLEASE EXPLAIN BRIEFLY

2564

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