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www.thoughtco.com/definition-of-primary-standard-and...

A secondary standard is a chemical that has been standardized against a primary standard for use in a specific analysis. Secondary standards are commonly used to calibrate analytical methods. NaOH, once its concentration has been validated through the use of a primary standard, is often used as a secondary standard.

en.wikipedia.org/wiki/Primary_standard

A primary standard in metrology is a standard that is sufficiently accurate such that it is not calibrated by or subordinate to other standards. Primary standards are defined via other quantities like length, mass and time.Primary standards are used to calibrate other standards referred to as working standards.

pediaa.com/difference-between-primary-and-secondary...

What is a Secondary Standard Solution. A secondary standard solution is a solution that is made specifically for a certain analysis. A secondary standard is a substance whose active agent contents have been found by comparison against a primary standard.

sciencing.com/four-characteristics-primary-standard...

Chemists almost always carry out reactions involving primary standards in aqueous solutions, which necessitates that the primary standard dissolve easily in water. Silver chloride (AgCl), for example, satisfies all of the other requirements of primary standards, but it will not dissolve in water and therefore cannot serve as a primary standard.

www.quora.com/What-are-the-examples-of-primary-and...

A primary standard is a reagent that is extremely pure, stable, it not a hydrate/has no water of hydration, and has a high molecular weight. Examples of primary standards for titration of acids are: >> sodium carbonate: Na2CO3, mol wt. = 105.99 g/...

education.seattlepi.com/characteristics-primary-standard...

A primary standard is a reference chemical used to measure an unknown concentration of another known chemical. It can be used directly when performing titrations or used to calibrate standard solutions. Primary standards exhibit distinctive characteristics that ideally suit them for making accurate and reliable ...

www.chemistry-assignment.com/primary-standard-and-secondary...

A standard solution is one whose concentration is known (to an appropriate number of significant figures, s.f.) and which doesn’t go off with time i.e. is stable. A standard solution is prepared by dissolving a definite weight of substance (a primary standard), in a definite volume.

www.answers.com/Q/What_is_a_primary_standard_solution

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 ...

www.chemicool.com/definition/primary_standards.html

Definition of Primary Standards. What are Primary Standards? Standards are materials containing a known concentration of a substance. They provide a reference to determine unknown concentrations or to calibrate analytical instruments. In order to be used as a primary standard, a substance must meet four key criteria. It must:

goldbook.iupac.org/html/S/S05924.html

A solution of accurately known concentration, prepared using standard substances in one of several ways. A primary standard is a substance of known high purity which may be dissolved in a known volume of solvent to give a primary standard solution.