whai is primary standard?

Answer Posted / narasaiah aurobindo

It must be purity,and impurities are not exceed 0.02 to
0.05%.it should not be hygroscopic and not oxidised by
air.under drying condition it will be stable.during the
storage condition its chemical structure should not be changed.

Is This Answer Correct ?    6 Yes 0 No



Post New Answer       View All Answers


Please Help Members By Posting Answers For Below Questions

How to fix the sample conc. in Related substances test by HPLC?

619


what is difference in ods I ods II is this is realy from sorbent / packing characteristics or from other means

1497


A ha tc is actual defination of retention time?

1067


why are measure gas flow " ml " in Gas chromatography

1160


calibrtion procedue of LC-MS

2153






We use Potassium Dichromate solution for the calibration of UV-Visible Spectrophotometer in UV region. My question is to calibrate visible region which solution could be used in photometric accuracy

1324


if tech transfer fails whay require to do?

340


how to select short coloum and long coloumn for new molecule

1824


what is the principle of UV Vis spectroscopy, AAS, ICP OES,ICPAES, ICP-MS and FTIR

8461


For limit test of heavy metals in BP, Method C require that the substance is ignited at a temperature not exceeding 800 °C. Why confines such the temperature?

3502


what is mean by 40 in the dissolution basket mesh size?

299


4. Describe the operation of the Craig apparatus. Chapter.3 Equilibrium Processes in Separations

2165


how much mass should be there in volumetric flask while in preparation of sample for assay? 

2064


how to set sample and standard concentration in RS method?

366


in each media we require to use SLS? how to proceed?

303