methylene iodide

noun

, Chemistry.

1. a yellow liquid, CH 2 I 2 , soluble in alcohol and ether: used for the separation of mixtures of minerals and in organic synthesis.

Example Sentences

In the “diffusion column” method, a liquid column uniformly varying in density from about 3.3 to 1 is prepared by pouring a little methylene iodide into a long test tube and adding five times as much benzene.

From Project Gutenberg

Methylene iodide, CH2I2, has a density of 3.33, and may be diluted with benzene.

From Project Gutenberg

To identify any one of the stones which lie between those limits on the diagram, it is only necessary to drop it into a test tube or small vessel containing methylene iodide—the stone will float—benzene is added drop by drop, the mixture being kept well stirred until a point is reached at which the stone neither sinks nor floats.

From Project Gutenberg

The salt fuses at 75� C. to a clear colorless liquid in which zircon just floats; it further possesses the useful property of being miscible in all proportions with water, so that the specific gravity can be reduced to any desired extent by adding water, just as that of methylene iodide, was reduced by adding benzene.

From Project Gutenberg

The nitrate might be used by itself to include the whole series, but it is more convenient to use the methylene iodide when possible, both because it can be employed at ordinary temperatures and because it is cheaper than the nitrate.

From Project Gutenberg