Primary standards have some peculiar properties
Secondary standards are
Zeryawkal Ergetie
(Msc in pharmaceutical Analysis )
solution that changes it's strength with the passage of time.
Standards are necessary for the validation of analytical chemistry methods and instruments, to resolve litigations, to implement a qulity system in laboratory etc.
Primary standard solutions are certified standard materials; secondary standard solutions are standardized with the help of primary standard solutions.
there are two types of standard solution 1 primary 2 secondary
primary standard solution is prepared by direct measurements of the mass of solute and the volume of solution.whereas, a secondary standard solution is a solution whose concentration can't be determined directly from weight of solute and volume of solution, the concentration must be determined by analysis of the solution itself.
HCl is not used as a primary standard
it is a secondary solution because it can change its concentration by absorbing moisture....
because EDTA is obey all conditions of primary standard except high purity
there are two types of standard solution 1 primary 2 secondary
- dipotassium hydrogen phosphate is used to prepare buffers - for chemical analysis by spectrometry standard solutions of potassium exist
West's Analysis of American Law is considered a secondary authority. It provides commentary and analysis on legal topics rather than directly interpreting primary sources of law.
Primary topics are often secondary sources. Secondary sources analyze in review or summarize information.
primary standard solution is prepared by direct measurements of the mass of solute and the volume of solution.whereas, a secondary standard solution is a solution whose concentration can't be determined directly from weight of solute and volume of solution, the concentration must be determined by analysis of the solution itself.
HCl is not used as a primary standard
Meta analysis is a type of secondary research, in which primary research is again analyzed
it is a secondary solution because it can change its concentration by absorbing moisture....
aqueous solutions are not stable for long
It is a primary source because it came directly from him. An analysis of the speech written by a columnist would be a secondary source.
Those data that are derived from the analysis or treatement of primary data such as secondary structures, hydrophobicity plots, and domain are stored in secondary databases
A primary source is a document, speech, or other sort of evidence written, created or otherwise produced during the time under study. Secondary sources provide interpretation and analysis of primary sources.