Among chemists, the morning coffee-break is a well-established custom. During these informal symposia much worth-while data are exchanged. We should like to sit in and tell you about some of our 1,000 plus MERCK LABORATORY CHEMICALS. HOW DRY I A M
After 5 o'clock, a r i d i t y carries highly desirable connotations as witnessed by the ever-growing popularity of the dry martini. Knowing that dryness is often equally desirable in the realm of retort and reaction, Merck is introducing an improved Anhydrous Ether. This special re agent is so nearly water-free it can be used in the Grignard reaction as is, thus eliminating laborious dehydration steps; and its perox ide content is so low, we had to devise an especially sensitive test to track it down.
PURITY FOR THE PERFECTIONIST
superb purity that it may be used as a primary standard in argentometry. Besides being subjected to the regular A.C.S. tests, each lot is spectrographically analyzed. Typical lots show less than 2 ppm. of copper, iron, and lead. Really fine for chloride titrations and in the preparation of silver and silver chloride electrodes.
Talking purity with the analytical chemist is like talking recipes with Duncan Hines. Nevertheless, M E R C K SILVER NITRATE is of such
COLLECTOR'S ITEM
Human foibles know no bounds. Some people like to read diction aries; others collect catalogs. For the latter we'd like to announce a new edition of the MERCK LABO RATORY CHEMICALS CATALOG. This
ISOPROPYL ALCOHOL SPECTRO GRADE
opus, our twentieth in fifty years, is physically bigger (6" χ 9" pages), easier to read, and arranged ac cording to A. C. S. nomenclature.
Chemistry, as it is practiced today, is so highly mechanized that it is doubly tedious to have to resort to old-fashioned procedures. That's why we believe physical and ana l y t i c a l c h e m i s t s will welcome M E R C K ISOPROPYL ALCOHOL SPECTRO GRADE with some of the
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come up with clock-like regularity and the chemist avoids the ennui of redistillation.
enthusiasm usually reserved for a cold beer on a hot day. This Merck exclusive shows absorbancies not greater than 0.2 at 235 ταμ, 0.1 at 250 πΐμ, 0.1 at 275 m/i, and 0.05 at 300 m/i. Thus, when used as a solvent for ultraviolet spectro photometry, low solvent blanks
For the edification of our friends, the catalog gives specs on all our reagents, including many organic solvents. Ranges of useful transmittance are listed for the spectro solvents. This year's catalog is a supersonic effort. Let us know how many copies you need and they will be sent to you—gratis, of course. MERCK LABORATORY CHEMICALS
M E R C K & CO., INC.
Precision Tools
Manufacturing
for Accurate Analysis
R A H W A Y ,
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Chemists J E R S E Y
® Merck & Co., Inc.
For further information, circle number 16 A on Readers' Service Card, page 51 A
16 A
ANALYTICAL
CHEMISTRY
