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Why we don't add Hcl, HNO3, H3PO4 in residue on ignition, why we add H2SO4
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Because sulphates are more stable at 800 degrees when compared with chlorides and nitrates
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what is assay in hplc
If compound Pka is 5 then which buffer you will select ?
what is mean by 40 in the dissolution basket mesh size?
How long we can use hygroscopic reference standard in terms of water absorb.I mean in line with respective monograph's specification or more than that?
how can we decide the limit of cleaning validation? What is the criteria for it?
Why sometime potassium ortho phosphate mix with acetone use for sample preparation for hplc
At what distance the sample is collected in dissolution basket?
[3/28, 20:52] Manoj P Venkatpurwar: how many impurities require to inject in assay specificity that how we can find out? and in Rs also how?
Why base line not start from zero in GC Chromatography analysis.
Why Na lamp is used in polarimeter?
differance between L1 and L7 columns
in DMF having extra impurities and in api COA also having extra imp than USP or BP product then how require to proceed?
Organic Chemistry 
