A Scheme for the Detection of the More Common Classes of Carbon Compounds
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Heat I gram solid KOH with 0-5 c. C. H 2 O in a crucible till melted, then add about O'$ gram of acid ; carefully heat till effer- vescence ceases and mass nearly solidifies (do not char). Boil fused mass with 20 c. C. Water, and filter. The filtrate contains the K salts of the acids formed during the fusion. These may be tested for Acrylic acid, b. P. 139. CH 2 = CH. COOH + 2 KOH = HCO 2 K + CH 3 C0 2 K + H 2 . Crotonic acid, m. P. 72. CH 3 . CH = CH. CO 2 H + 2KOH = CH 3 C0 2 K + CH 3 C0 2 K ...+ H 2 .
Angelic acid, m. P. 45. ^'^^C. CO. H + 2KOH = CH 3 . CO 2 H + CH 3 . CH 2 CO 2 K + H 2 . Oleic acid, m. P. 14. Yields palmitic and acetic acids. Cinnamic acid, m. P. 133. C 6 H 5 CH = CH. CO 2 H + 2KOH - C 6 H 5 C0 2 K + CH 3 C0 2 K + H 2 .
o-Coumaric acid, m. P. 208 (with decomp. ). Yields C 6 H 4 *y and CH 3 CO 2 H. Alk. Salt solns. Yellow with green fluorescence.
C. HYDROXY ACIDS.
(a) To a neutral solution add 2 or 3 drops of 10 / FeCl 3 soln.
(a) Hydroxy acids produce a yellow coloration ; a-hydroxy acids a strong yellow colour.
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You can find similar books in the "Read Also" column, or choose other free books by Frank Edwin Weston to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
Heat I gram solid KOH with 0-5 c. C. H 2 O in a crucible till melted, then add about O'$ gram of acid ; carefully heat till effer- vescence ceases and mass nearly solidifies (do not char). Boil fused mass with 20 c. C. Water, and filter. The filtrate contains the K salts of the acids formed during the fusion. These may be tested for Acrylic acid, b. P. 139. CH 2 = CH. COOH + 2 KOH = HCO 2 K + CH 3 C0 2 K + H 2 . Crotonic acid, m. P. 72. CH 3 . CH = CH. CO 2 H + 2KOH = CH 3 C0 2 K + CH 3 C0 2 K ...+ H 2 .
Angelic acid, m. P. 45. ^'^^C. CO. H + 2KOH = CH 3 . CO 2 H + CH 3 . CH 2 CO 2 K + H 2 . Oleic acid, m. P. 14. Yields palmitic and acetic acids. Cinnamic acid, m. P. 133. C 6 H 5 CH = CH. CO 2 H + 2KOH - C 6 H 5 C0 2 K + CH 3 C0 2 K + H 2 .
o-Coumaric acid, m. P. 208 (with decomp. ). Yields C 6 H 4 *y and CH 3 CO 2 H. Alk. Salt solns. Yellow with green fluorescence.
C. HYDROXY ACIDS.
(a) To a neutral solution add 2 or 3 drops of 10 / FeCl 3 soln.
(a) Hydroxy acids produce a yellow coloration ; a-hydroxy acids a strong yellow colour.
What to read after A Scheme for the Detection of the More Common Classes of Carbon Compounds?
You can find similar books in the "Read Also" column, or choose other free books by Frank Edwin Weston to read onlineMoreLess
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