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  2. Reagent Chemicals - Wikipedia

    en.wikipedia.org/wiki/Reagent_Chemicals

    Reagent Chemicals [a] is a publication of the American Chemical Society (ACS) Committee on Analytical Reagents, [1] detailing standards of purity for over four hundred of the most widely used chemicals in laboratory analyses and chemical research. Chemicals that meet this standard may be sold as "ACS Reagent Grade" materials.

  3. Chemical purity - Wikipedia

    en.wikipedia.org/wiki/Chemical_purity

    ACS grade is the highest level of purity, and meets the standards set by the American Chemical Society (ACS). The official descriptions of the ACS levels of purity is documented in the Reagent Chemicals publication, issued by the ACS. [3] [4] It is suitable for food and laboratory uses. Reagent grade is almost as stringent as the ACS grade.

  4. List of reagents - Wikipedia

    en.wikipedia.org/wiki/List_of_reagents

    the central organic synthesis reagent for hydroboration Dicyclohexylcarbodiimide: an organic compound; primary use is to couple amino acids during artificial peptide synthesis Diethyl azodicarboxylate: a valuable reagent but also quite dangerous and explodes upon heating Diethyl ether: organic compound; a common laboratory solvent Dihydropyran

  5. Primary standard - Wikipedia

    en.wikipedia.org/wiki/Primary_standard

    Here, a primary standard is typically a reagent which can be weighed easily, and which is so pure that its weight is truly representative of the number of moles of substance contained. Features of a primary standard include: High purity; Stability (low reactivity) Low hygroscopicity (to minimize weight changes due to humidity)

  6. Reagent - Wikipedia

    en.wikipedia.org/wiki/Reagent

    In chemistry, a reagent (/ r i ˈ eɪ dʒ ən t / ree-AY-jənt) or analytical reagent is a substance or compound added to a system to cause a chemical reaction, or test if one occurs. [1] The terms reactant and reagent are often used interchangeably, but reactant specifies a substance consumed in the course of a chemical reaction. [ 1 ]

  7. Trump’s victory has some liberal judges reversing their ...

    www.aol.com/news/trump-victory-liberal-judges...

    The recent reversals by two US district judges on plans to step down from their seats, effectively denying President-elect Donald Trump the opportunity to replace them, has put attention on other ...

  8. Mortgage and refinance rates for Dec. 2, 2024: Average rates ...

    www.aol.com/finance/mortgage-and-refinance-rates...

    Average mortgage rates for popular terms are finally inching down week over week as of Monday, December 2, 2024, with the 30-year fixed purchase rate retreating from 7.00%.

  9. N-(1-Naphthyl)ethylenediamine - Wikipedia

    en.wikipedia.org/wiki/N-(1-Naphthyl)ethylenediamine

    N-(1-Naphthyl)ethylenediamine dihydrochloride is widely used in the quantitative analysis of nitrate and nitrite in water samples by colorimetry.It readily undergoes a diazonium coupling reaction in the presence of nitrite to give a strongly colored azo compound.