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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.

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:

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.

www.petropedia.com/definition/8515/primary-standard

A primary standard is defined via other quantities like length, mass and time. The primary standards are the reference or subordinate to the secondary standards which means that in order to get a pass certificate from an issuing authority an object has to meet all the requirements mentioned as per the primary standards.

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

Difference Between Primary and Secondary Standard Solution Definition. Primary Standard Solution: Primary standard solutions are solutions made out of primary standard substances. Secondary Standard Solution: Secondary standard solutions are solutions made specifically for a certain analysis.

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/...

www.chemicool.com/definition/standards.html

Primary Standards. A primary standard is a reagent that is extremely pure and stable; it not a hydrate/it has no water of hydration, and it has a high molecular weight. Examples of primary standards for titration of acids are: • sodium carbonate: Na 2 CO 3, mol wt. = 105.99 g/mol

www.reference.com/science/primary-standard-chemistry-4b252...

A primary standard is an element of high purity that is used to measure an indefinite chemical concentration of a known reactant chemical. It is used to perform titration or to calibrate standard solutions.

www.quora.com/What-is-the-difference-between-primary-and...

Definition of Standards Standards are materials containing a precisely known concentration of a substance for use in quantitative analysis. A standard provides a reference that can be used to determine unknown concentrations or to calibrate analytical instruments. Primary Standards A primary standard is a reagent that is extremely pure, stable, it not a hydrate /has no water of hydration, and ...

www.reference.com/science/primary-standard-titration-a2d...

Titration is a common method used to determine the concentration or amount of an unknown substance. Chemicool defines a primary standard titration as an extremely pure reagent that has no waters of hydration and that has a relatively higher molecular weight.