Optical Activity And Chemical Composition
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It would also appear that the high activity of the solutions is not connected with dissociation phenomena, for the action of uranyl 42 OPTICAL ACTIVITY 9 salts on malic, tartaric, and quinic acids is almost as great in alcoholic as in aqueous solution. (6) Sugars. The rotation of cane sugar in aqueous solution ([a] D = about +66'5) is reduced to nearly 60 by the presence of neutral inorganic salts of the alkalis or alkaline earths. Borax also produces a decrease. The action of all these salts i...ncreases with the amount present. Calcium chloride increases the specific rotation of dextrose from about 55 to 60 when it is present in the solution to the extent of 20 per cent. The compounds of the mannitol group (arabitol, mannitol, sorbitol, talitol, mannoheptitol, &c. ), which exhibit hardly any rotatory power in pure aqueous solution, become highly active on the addition of borax. In this way the specific rotation of d-man- nitol may be raised to + 28'3. Borax is often used to make the activity more evident.
What to read after Optical Activity And Chemical Composition?
You can find similar books in the "Read Also" column, or choose other free books by H Hans Landolt to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
It would also appear that the high activity of the solutions is not connected with dissociation phenomena, for the action of uranyl 42 OPTICAL ACTIVITY 9 salts on malic, tartaric, and quinic acids is almost as great in alcoholic as in aqueous solution. (6) Sugars. The rotation of cane sugar in aqueous solution ([a] D = about +66'5) is reduced to nearly 60 by the presence of neutral inorganic salts of the alkalis or alkaline earths. Borax also produces a decrease. The action of all these salts i...ncreases with the amount present. Calcium chloride increases the specific rotation of dextrose from about 55 to 60 when it is present in the solution to the extent of 20 per cent. The compounds of the mannitol group (arabitol, mannitol, sorbitol, talitol, mannoheptitol, &c. ), which exhibit hardly any rotatory power in pure aqueous solution, become highly active on the addition of borax. In this way the specific rotation of d-man- nitol may be raised to + 28'3. Borax is often used to make the activity more evident.
What to read after Optical Activity And Chemical Composition?
You can find similar books in the "Read Also" column, or choose other free books by H Hans Landolt to read onlineMoreLess
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