Racemic acid and tartaric acid have exactly the same composition, and yield, when exposed to heat, the same products; the racemates also correspond in the closest manner with the tartrates.
In fact, some samples of mother liquor from factories where evaporation was carried on in a partial vacuum contained more racemic acid than others from factories where evaporation was carried on over a pure fire.
A solution of racemic acid precipitates a neutral salt of calcium, which is not the case with tartaric acid.
Examination of liquors from which racemic acid has been deposited has always shown them to contain much inactive tartaric acid.
This theory does not exclude the probability that certain vines under particular conditions produce racemic acid.
A solution of racemic acid does not affect a ray of polarised light, while a solution of tartaric acid rotates the ray to the right.
Racemic acid is rather less soluble than tartaric, and separates first from a solution containing the two acids.
By extension, any one of the series of isomeric acids (racemic acid, levotartaric acid, inactive tartaric acid) of which tartaric acid proper is the type.
As can be seen, the curve for the racemic tartrate occupies a large part of the diagram, {218} while that for racemic mandelic acid is much smaller.
In the one case, therefore, the racemiccompound has a higher, in the other a lower melting point than the active forms.
The behaviour of sodium ammonium racemate is of interest from the fact that it was the firstracemic substance to be resolved into its optically active forms by a process of crystallization.
It will be observed that the summit of the curve for the partially racemic mandelate is very flat, indicating that the compound is largely dissociated into its components at the temperature of fusion.
The form of the isothermal solubility curves is also of great value for determining whether an inactive substance is a racemiccompound or a conglomerate of equal proportions of the optical antipodes.
The inactive substance is a pseudo-racemic mixed crystal.
We shall at a later point meet with examples of a racemic compound changing into a dl-mixture at a definite transition point; and the pseudo-racemic mixed crystal of camphoroxime is an example of the second transformation.
Even in the case of crystalline substances, where the differences between the various forms is greater, it was not always easy to discriminate between the dl-mixture and the racemic compound.
The upper isothermal acb represents the solubility relations when the formation of a racemic compound is excluded, as, e.
Hence, it may exist in dextro, levo, and racemic forms.
It was in that same year that Pasteur put on record his discovery of the nature of racemic acid, his first great service to science, from which all his other services were to proceed.
He succeeded in keeping alive one of the commonest moulds on the surface of ashes and racemic acid, and saw the laevo-tartaric acid appear.
Racemic acid, however, which is identical with tartaric acid in its chemical constituents, is optically inactive, rotating the plane of polarized light neither to the right nor the left.
The synthetic is inactive presumably due simply to a racemic mixture of isomers.
The above list will hopefully give you a few useful examples demonstrating the appropriate usage of "racemic" in a variety of sentences. We hope that you will now be able to make sentences using this word.
