1 / 6

Experiment 9. Identification of Unknowns

Experiment 9. Identification of Unknowns. SOLUBILITY CLASSES. insol. AA. Litmus red. ether. CA AM N. sol. Litmus blue. sol. Litmus unchanged. sol. water. 5% NaHCO 3. SA. sol. WA. insol. 5% NaOH. insol. sol. B. 5% HCl. sol. insol. N. 96% H 2 SO 4. insol. I. insol.

duncan-brewer
Download Presentation

Experiment 9. Identification of Unknowns

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Experiment 9. Identification of Unknowns

  2. SOLUBILITY CLASSES insol AA Litmus red ether CA AM N sol Litmus blue sol Litmus unchanged sol water 5% NaHCO3 SA sol WA insol 5% NaOH insol sol B 5% HCl sol insol N 96% H2SO4 insol I insol

  3. AA amino acids CA carboxylic acids (5 carbons or less) AM amines (5 carbons or less) N alcohols, aldehydes, ketones, nitriles, amides (5 carbons or less) SA carboxylic acids, phenols with strong electron withdrawing groups (5 carbons or less) WA weak acids, phenols, enols, oximes, imides, 1,3-diones, nitro compounds B aliphatic amines, anilines N alcohols, aldehydes esters, ketones, ethers, alkynes, akenes I saturated hydrocarbons, haloalkanes, aryl halides

  4. Unknowns 1. Carboxylic acids can be characterized by a neutralization equivalent; 2. Amines can be characterized by a neutralization equivalent; 3. Ketones can be characterized by a 2,4-dinitrophenyl hydrazone derivative, oxime or related compound; 4. Alcohols can be derivatized by phenyl isocyanide derivative, oxidation to a solid carboxylic acid or ketone; 5. Esters can be characterized by hydrolysis if the acid or alcohol is a solid; 6. Other compounds can be characterized on the basis of derivatives based on their likely structure.

  5. Department of ChemistryUniversity of Missouri-St. LouisSolid UnknownChemistry 263 Preliminary Report FormName: ________________Date: _­­­_______Unknown Number ______Physical Propertiesa) appearance:b) melting point:c) boiling point:e) other properties you may have measured:Solubility Tests (use +/- to indicate positive, negative tests)H2O: _____; 5%NaOH, _____; 5%NaHCO3, _____; 5%HCl, _____ ; H2SO4,_____.pH(aqueous solution): _____ .

  6. Department of Chemistry University of Missouri-St. Louis Solid Unknown Chemistry 263 Preliminary Report Form Name: _____________ Date: Unknown Number ______ Physical Properties a) appearance: b) melting point: c) boiling point: e) other properties you may have measured: Solubility Tests (use +/- to indicate positive, negative tests) H2O: _____; 5%NaOH, _____; 5%NaHCO3, _____; 5%HCl, _____ ; H2SO4,_____. pH(aqueous solution): _____ .

More Related