Jump to content

chenbeier

Senior Members
  • Posts

    505
  • Joined

  • Last visited

  • Days Won

    2

chenbeier last won the day on January 9

chenbeier had the most liked content!

2 Followers

Profile Information

  • Favorite Area of Science
    Chemistry

Recent Profile Visitors

The recent visitors block is disabled and is not being shown to other users.

chenbeier's Achievements

Molecule

Molecule (6/13)

46

Reputation

  1. Autolyzed yeast extract is a flavoring agent made from yeast, usually the same kind used to make bread rise or ferment beer. Generally, the yeast is heated or otherwise killed in a way that allows enzymes inside the cells break down the yeast, including the proteins.
  2. Boil the solution, after cool down filter it, so you get a saturated solution. Settle down is also option, but difficult to decant the solution.
  3. It was (is) a common process before electrolysis was invented. https://www.elettronicaveneta.com/en/prodotto/cb-in-103-ev-preparation-of-sodium-hydroxide-by-caustification-of-carbonate/
  4. I think there is an error . CH3SO2 is wrong. It is sodium and Dimethylsulfon (CH3)2SO2 as reactant this forms the CH active sodium salt CH3SO2CH2- + Na+. This will attack the Ester and the Methanolate will be pushed out. No water involved. RCO-OCH3 + CH3SO2CH2- => RCO-CH2SO2CH3 + CH3O- This will be neutralised with mild acid.
  5. I think you can only add a solubilizer to make a emulsion.
  6. That is what he is doing. In solution you have Na+, K+ and the [OOCCHOHCHOHCOO]2 - present. It doesn't matter you add NaOH or KOH first to the tartratic acid. Also possible you mix 1 mol sodium tartrate with 1 mol potassium tartrate in solution.
  7. What is 1020's. Do you mean 1920's, do you.
  8. Smell like vodka is ethanol. Smell like air in hospital is isopropanol.
  9. Yes you can use it.
  10. Methylated spiritus, the same what is used for camping cooler.
  11. 1. Addition of bromine 2. Saponification of Ester 3. Elimination of bromine and CO2
  12. Mesoxalic acid can be obtained synthetically by hydrolysis of alloxan with baryta water,[2] by warming caffuric acid[3] with lead acetate solution,[2] or from glyceryl diacetate and concentrated nitric acid in ice-cold water. The product can be obtained also by oxidation of tartronic acid[4] or glycerol.[5] Since they are carried out in water, these procedures generally give the dihydroxy derivative. It is also prepared by the oxidation of glycerol with the help of bismuth(III) nitrate. References Merck Index (12th ed.). p. 5971. Henry Enfield Roscoe (1888), A Treatise on Chemistry, volume 3, part2 Organic Chemistry, p. 161. D. Appleton and Co., New York The chemical structure of caffuric acid was given in Allen, W. F. (1932). The preparation and pyrolytic molecular rearrangment [sic] of the 8-ethers of caffeine: And their conversion to 8-methyl and 8-ethylcaffeine. Ann Arbor, Mich.: Edwards Brothers. Rosaria Ciriminna and Mario Pagliaro (2004), Oxidation of tartronic acid and dihydroxyacetone to sodium mesoxalate mediated by TEMPO. Tetrahedron Letters, volume 45, issue 34, pp. 6381–6383 doi:10.1016/j.tetlet.2004.07.021 Rosaria Ciriminna and Mario Pagliaro (2003), One-Pot Homogeneous and Heterogeneous Oxidation of Glycerol to Ketomalonic Acid Mediated by TEMPO. Advanced Synthesis & Catalysis, volume 345, issue 3, Pages 383–388. doi:10.1002/adsc.200390043
  13. https://images.app.goo.gl/RtqgCgdzHrNWMcpp9 https://images.app.goo.gl/48aDjbimwyGXnR3o8 Corrosion
  14. That is your experience, I have another one. Old Lithiumcells get a white residue coming out the battery.
×
×
  • Create New...

Important Information

We have placed cookies on your device to help make this website better. You can adjust your cookie settings, otherwise we'll assume you're okay to continue.