German Version

Korbi's Laboratory - Contents 

Last Update August 30, 2011

Index

• What's new?
• Experimental Techniques, Safety and Environment
• Compounds
• Experiments
• Links
• Writings
• About me, Website, Contact

What's new?

• [Webmaster] After a longer pause this site is now (July 2011) again current, a new section "Writings" has been added.
• After a longer period of absence Korbi's Labor is back again. Thanks to all who have kept the faith! And my apologies to all those who wasted their time searching for this site. Due to a change in the webhoster and other circumstances I was not even able to include a short explanation about the situation. My apologies again!
• Admittedly the layout appears even more old-fashioned than ever, but apart from the fact that it is just simpler to maintain, I have always been of the opinion that unadorned internet sites are the most pleasant to use. In addition, please excuse any other faults, it was important for me just to get this site online again!

Experimental Techniques

• Guidelines concerning the handling of chemical substances
• Considerations concerning the establishment of a chemical laboratory
• A simple procedure for the determination of the melting point

Safety and Environment

• Explanation of danger symbols
• List of risk and safety definitions (German)
• Designation, risk and safety definitions for various dangerous substances
• Considerations for the disposal of dangerous substances

Acquisition of Chemicals and Laboratory Apparatus

• Sources for the acquisition of chemicals (German)

Compounds

• Production of various solutions and reagents
• Demonstration of a titanium(IV)-solution for analysis
• Preparation of a potassium cyanide solution [removed]
• Preparative demonstration of DL-mandelic acid ethyl ester
• Synthesis of aspirin without acetic anhydride

Experiments

• General Procedures

  • Sublimation (with phthalic anhydride as an example)

• Anorganic Chemistry

  • Precipitation reactions

    • Halides and pseudohalides with silver nitrate
    • Precipitation of Ferricyanide(III) with silver nitrate
    • Verification of phosphate with ammonium molybdate
    • Verification of carbonate and sulphate barium hydroxide
    • Precipitation and reduction of thiosulfate with silver nitrate
    • Various precipitation examples for lead(II)

  • Alkaline metals

    • Demonstration of sodium carbonate derived from sodium hydrogen carbonate
    • Oxidation of melted saltpeter

  • Aluminium

    • Verification of aluminium with alizarin
    • Verification of aluminium with morin
    • Presentation of aluminium(III)-iodide

  • Copper

    • Reversible hydrate formation of copper(II)-sulfate
    • Precipitation and complexation of copper(II) with an ammonia solution
    • Verification of copper and cadmium with dithizone

  • Halogenes

    • Demonstration of bromine
    • Demonstration of iodine

  • Hydrogen peroxide

    • Oxidation of manganese(II) sulfate
    • Reduction of potassium permanganate

  • Iron

    • Verification of iron(III) mit acetylacetone
    • Verification of iron(III) with potassium cyanide
    • Verification of iron(III) with thiocyanate

  • Other sub-group elements

    • Demonstration of Thenards blue
    • Verification of vanadium(V) as vanadium(IV)
    • Verification of titanium(IV) with hydrogen peroxide

  • Miscellaneous

    • Verification of sulfite with formaldehyde

• Organic Chemistry

  • Aldehydes

    • Verification of aldehydes with Schiff's reagent
    • Verification of aldehydes with Tollens' test
    • Differentiation of formaldehyde from other higher aldehydes

  • Alkenes

    • Demonstration and verification of ethylene
    • Verification of alkenes with concentrated sulphuric acid
    • Verification of alkenes with bromine

  • Alkynes

    • Demonstration and combustion of acetylene

  • Alcohols

    • Verification of alcohols with Cerium(IV) ammonium nitrate

  • Amines

    • Creation and verfication of aniline
    • Demonstration of aniline black dye

  • Arene

    • Zinc dust distillation of 2-naphthol

  • Azo dyes

    • Demonstration of orange II

  • Carboxylic acids

    • Reduction capacity of various carboxylic acids
    • Demonstration of pyridine derived from nicotinic acid
    • Demonstration of adipic acid derived from cyclohexanone

  • Esters

    • Demonstration of ethyl benzoate
    • Demonstration of ethyl acetate
    • Demonstration of pentyl acetate

  • Ethers

    • Demonstration of diethyl ether

  • Halogen compounds

    • Demonstration of chloroform
    • Demonstration of iodoform

  • Ketones

    • Demonstration of acetone derived from lime
    • Demonstration of cyclopentane derived from adipic acid

  • Nitro compounds

    • Demonstration of nitrobenzene
    • Demonstration of m-dinitrobenzene

  • Phenoles

    • The decarboxylation of salicylic acid
    • Verification of phenoles with iron(III) chloride
    • Verification of phenol with the Liebermann-Test
    • Demonstration of phenolphthalein

  • Sugars

    • Verification of fructose as hydroxymethylfurfural
    • Verification of reducing sugar with Fehling's solution
    • Verification of reducing sugar with tetrazolium red

  • Miscellaneous

    • Oxidation of organic compounds with chromic acid
    • Verification of urea as biuret

• Other experiments

  • Earlier Experiments (German)
  • Experiments 2008 (pdf, German/English)

Links

• Link collection

  • ChemLin - many, many links in the field of chemistry and related fields

• Additional sites for Hobby Chemists

  • Chemieexperimente.de (German)
  • Experimentalchemie.de - all sorts of information and links, well organised (German)
  • VersuchsChemie.de (German)
  • www.kopfgeist.com (German)
  • Prof. Blumes Bildungsserver für Chemie - many interesting experiments (German)
  • Chemistry homepage of Thomas Seilnacht quite extensive and informative, experiments with photos and films (German)

• Experimental Techniques

  • Basic laboratory techniques in videos - Chinese with English subtitles, very much recommended

• Safety and Disposal

  • Neutralization of various chemicals - quite extensive (via Archive.org)
  • The E-symbols and the disposal of selected substances (German)
  • Safety data sheets and toxicological data - very extensive
  • Prof. Blume: Sicherheit im Chemiesaal - in addition quite entertaining (German)

• Special Subject Areas

  • Organic Syntheses™ - aside from the fact that one has to use ActiveX, simply ingenious. Well linked organic syntheses of all types, along with tested experiments. Text and structural search.
  • The Named Organic Reactions Collection - from the University of Oxford (via Archive.org, Stand 2003)
  • WebElements Periodic Table - a very good periodic table
  • Lanthanides (German)
  • Hydrogen Peroxide Online - everything you want to know about hydrogen peroxide
  • East Carolina University's Glassblowing Services - a lot of information about glass and glassblowing
  • Chirality and Odor Perception - concerning scents and odors of many optical antipodes, with respective literature references
  • Fischer-Tropsch Archive - many documents concerning the Fischer-Tropsch procedure (extraction of petrol from coal

• Miscellaneous

  • Automatic calculation of reaction yields - works well
  • Sodium explodes due to reaction with water - delightful film from Thomas Seilnacht's homepage (see above)
  • Molecules with silly or unusual names - very amusing
  • Construction instructions for a magnetic stirrer - for enthusiastic technicians (via Archive.org)
  • The Structure of Morphine - comprehensive account of the structural research on morphine, numerous structural formulas and reaction schemes
  • The history of plastics - in English, in German among other things a Flash animation giving a short overview of the development of plastics
  • FlyBase - the complete genome of the fruitfly (Drosophila), entire DNA sequence and genome map

• Providers of laboratory instruments/chemicals (only for companies)

  • Merck KGaA
  • Sigma-Aldrich

• Providers of laboratory instruments/chemicals (also for private individuals)

  • Omikron GmbH - instruments and chemicals, also odorants/natural products, cosmetics, very satisfactory
  • Laborhandel Krumpholz - only instruments, but quick, inexpensive and good service
  • Digital Pocket Scales Europe - very inexpensive digital scales, fast delivery
  • Hofmann Laborglasgeräte - huge selection, not tested
  • Gaßner Glastechnik GmbH - wide range of products, especially customized design, inexpensive

• Non-chemical sites

  • SurfNext - Project to list all internet accesses and possibilities for surfing worldwide.

Writings

• Azo-dimorphinan-derivate (ADM) (pdf, German)
• Über meine persönliche wissenschaftliche Arbeit (pdf, German)
• Die Morphinanalkaloide der Papaveraceen und ihre halbsynthetischen Derivate (pdf, German, unfinished)

Concerning...

• ... this site
• ... me

I would be grateful for any suggestions or criticisms and I will gladly help in the answering of any practical chemical questions, insofar as my knowledge and capabilities are sufficient. Oh yes, if someone should find an invalid link, please report this immediately!

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