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Phenols

Phenols. Lab 4. Phenols. Phenols are compounds that have a hydroxyl group directly attached to a benzene ring Hydroxy benzene = phenol . P roperties . phenols are polar due to the ability to form hydrogen bond phenols are water soluble P henol can dissolve in NaoH

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Phenols

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  1. Phenols Lab 4

  2. Phenols • Phenols are compounds that have a hydroxyl group directly attached to a benzene ring • Hydroxy benzene = phenol

  3. Properties • phenols are polar due to the ability to form hydrogen bond • phenols are water soluble • Phenol can dissolve in NaoH • Phenolsare more acidic than alcoholsbut less acidic than Carboxylic acids.

  4. Uses & toxicity • Early uses for phenol was as an antiseptic. • Phenol is used as a starting material to make plastics, explosives such as picric acid, and drugs such as aspirin. • Toxic, harmful and corrosive • Skin burns

  5. Phenols Phenol Resorcinol Catechol

  6. Physical properties

  7. Chemical test

  8. General test • FeCL3 test : • Few mg of Phenols dissolve in water + 1-2 drop of FeCL3 • Results: • Phenol = violet color • Resorcinol = violet color • Catechol = Green color

  9. General test • FeCL3 test • Results: • Phenol Resorcinol Catechol violet color violet color Green color

  10. GENERAL TEST • Azo – dye formation test (( Diazotization test)) • drop aniline (red color) + dil.HCl (until dissolve) + NaNO2 (sod. Nitrite solution) = until faint pale yellow color - PUT IN ICE • Few phenol + 10% NaOH (until phenol dissolved) • Add (1) on (2) gradually

  11. GENERAL TEST • Result : • Phenol = ((Azo – dye formation))Orange – red color or ppt • Resorcinol = ((Azo – dye formation))Orange – red color or ppt • Catechol = No azo – dye form {Decomposition, dark purple color}

  12. GENERAL TEST • Azo – dye formation test (( Diazotization test)) Phenol Resorcinol ((Azo – dye formation))Orange – red color or ppt Catechol No azo – dye form {Decomposition, dark purple color}

  13. SPESIFIC TEST • Phthalein test : • Few mg of Phenol + phatalic anhydride + 4 drops con.H2SO4 cool = then pour it in beaker contain 20 ml of 10%NaOH

  14. SPESIFIC TEST • Phenol = Pink color • Resorcinol = Green fluorescence added water = fluorescence • Catechol = Blue color

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