Alcohols and Phenols
Essay by Marylisa Martinez • July 10, 2017 • Lab Report • 1,503 Words (7 Pages) • 1,377 Views
Date Performed: February 24, 2017
Group 2
Experiment No. 12
Alcohols and Phenols
OBJECTIVES:
- To differentiate alcohols from phenols
PROCEDURE:
A.
Ethyl alcohol Isopropyl alcohol Tertiary butyl alcohol[pic 1][pic 2][pic 3][pic 4][pic 5]
Equal amounts of conc. HCl[pic 6]
Shake & let stand[pic 7]
Observe
B.
Ethyl alcohol Isopropyl alcohol Tertiary butyl alcohol[pic 8][pic 9][pic 10]
[pic 11][pic 12]
5 drops K2Cr2O7& dilute H2SO4[pic 13]
Warm[pic 14]
Note odor & color[pic 15]
Compare
C.
Heat copper spiral[pic 16]
Plunge to small beaker w/ ½ ml methyl alcohol & 5ml water[pic 17]
Repeat 5 times[pic 18]
+ 0.5%resorcinol sol’n[pic 19]
Incline TT, ½ ml conc. H2SO4[pic 20]
Acid will form layer at bottom[pic 21]
Note color at the junction of the 2 layers
D
Phenol salicylic acid [pic 22][pic 23][pic 24][pic 25]
+2ml 10% KOH w/ crushed iced[pic 26]
+ gradually ½ ml acetic anhydride[pic 27]
Shake few min.[pic 28]
Compare
E.
Phenol Pentamethyl phenol[pic 29][pic 30]
[pic 31][pic 32]
+1ml water & drop of ferric chloride[pic 33]
Note color development
E.
phthalic anhydride + phenol[pic 34]
+ 2 dops conc. H2SO4[pic 35]
Heat gently[pic 36]
Until melt becomes dark red[pic 37]
Cool[pic 38]
+5ml water[pic 39]
+2 drops [pic 40]
[pic 41][pic 42][pic 43][pic 44]
2ml HCl 2ml diluted NaOH[pic 45][pic 46]
[pic 47][pic 48]
Observe
DATA AND RESULTS:
Table1.
Solute | Treatment | Observation |
Ethyl alcohol | Concentrated HCl | Slow formation of HCl surface layer |
Isopropyl alcohol | Rapid formation of HCl surface layer | |
Tertiary butyl alcohol | Moderate formation of HCl surface layer | |
Ethyl alcohol | 5 drops K2Cr2O7& dilute H2SO4 Warm | Dark orange, strong odor |
Isopropyl alcohol | Pale orange, no odor | |
Tertiary butyl alcohol | Orange, lighter odor | |
Methyl alcohol and water | ∆copper wire 0.5% resorcinol sol’n Conc. H2SO4 | In the bottom of the beaker there was a white like kerosene and it change in color which turned to lighter yellow or pale yellow an there was a black residue in the beaker. |
Test tube 1 (phenol) Test tube 2 (salicylic acid) | 10% KOH Crushed ice Acetic anhydride | In TT1 there was a formation of white precipitate while in TT2 pale pink precipitate was formed. |
Test tube 1 (phenol) Test tube 2 (pentamethyl phenol) | Water Ferric chloride | Phenol changed its color to purple while pentamethyl phenol was color green and formed a pink precipitate, also two layers in the solution was formed. |
Phthalic anhydride and phenols | Conc. sulphuric acid ∆ gently (low flame) Cool Water | As HCl was added the solution is still colorless, but when NaOH was added the solution change in color which is dark pink. |
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