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Related article: impurities. The variation observed in the MgO content of the different
amples, while partly due to the presence of magnesium as carbonate, is
mainly due to moisture which is not taken into account by the G. P. tests
ol parity. The authors therefore suggest the following alkalimetric test
far inclusion in the G. P. tests of purity of magnesia usta Cheap Glucophage : " 0.5 Gm. of the
calcined magnesia is heated with 30 Cc. of \ hydrochloric acid and about
w Cc. of water until solution is effected, a few drops of methyl orange
nhtion added, and the liquid titrated with \ KOH, of which not more
Aan 7.1 Cc. should be required to produce a yellow-red color." This
indicates a content of 93.5 per cent, of magnesium oxide any calcium
oxide and calcium or magnesium carbonate present being calculated and
Digitized by VjOOQ IC
258 REPORT ON THE PROGRESS OF PHARMACY.
included as magnesium oxide. This requirement can easily be complied
with by the manufacturer, and maintained by the pharmacist by proper |
methods of preservation. Apoth. Ztg., xxiv (1909), No. 73, 679-680.
**Cork Metar^ Identification as Magnesium, At one of the recent j
aeronautical exhibitions samples of a metal were shown under the name of
" cork metal," which was said to be 40 per cent, lighter than aluminum,
and to have numerous other properties which should make it a rival of the
latter. Great secrecy was maintained as to the nature of this wonderful
metal, but its properties were such as to cause F. J. Cheap Glucophage Willott to submit it to
chemical analysis. In appearance the metal resembles very strongly the
alloys known as magnalium. The surface presents a lusterless whitish-gray
color, both sheets and bars showing the scorings and scratches so fre-
quently found on badly rolled or drawn aluminum. Careful analysis gave
the following result: Aluminum, 0.04; iron, 0.017; zinc, 0.48; sodium,
0.2 1 ; magnesium, 99.30 per cent. It will be seen, therefore, that essen-
tially, '' cork metal " is nothing but magnesium, to which a small amount
of zinc has been added. Whether this latter has been purposely intro-
duced or, as is more probable, is merely present as an impurity, the author
cannot say. As the metal evolves hydrogen when immersed in water it
was found necessary to use organic solvents for the determination of the
specific gravity. In alcohol this was found to be 1.762, thus confirming
the conclusion that cork metal is in fact magnesium. Chem. News, Oct.
1, 1909, 162.
Electron A Magnesium Alloy Lighter than Aluminum. The following
statements concerning the new metal " Electron," which although of lighter
specific gravity than aluminum is much stronger, is given in " Pro-
metheus " : The new metal is a magnesium alloy of a silver- white color,
which may be moulded, pressed, rolled, drawn and polished, but oxidizes
rapidly on exposure to the air. Its specific gravity fluctuates between
1.75 and 2.0 (aluminum = 2.7 to 3.0). The melted and cast metal has a
tensile strength of about 18 Kgm. to the square millimeter with about 5
per cent, of Cheap Glucophage ductility, but by mechanical processes Cheap Glucophage of condensation, such
as pressure, rolling, drawing, etc., the tensile strength of the metal may be
increased to about 35 Kgm. to the square millimeter and the ductility to
18 per cent, without appreciably raising the specific gravity. Further
investigations of the specific properties of this interesting alloy Cheap Glucophage are in
progress. Pharm. Ztg., liv (1909), No. 98, 968.
Group of Rare Cheap Glucophage Earths Review of Researches to Identify its Members,
Dr. G. Urbain briefly reviews the researches which have engaged his
attention during the part fifteen years and were undertaken with the object
of identifying the individual members of the group of rare earth metals,
which, in accordance with the advance made since Sir William Crookes's Cheap Glucophage
Digitized by VjOOQ IC Cheap Glucophage
GROUP OF RARE EARTHS. 259
admirablg researches preceding this period, are now recognized. These
consist of the elements mentioned below in the order of the solubilities of
of their salts, by means of which they may be separated from each other
for identification. The chief obstacle in the separation of the rare earth
IS isomorphism : but this isomorphism has proven useful, in as much as
bismuth, though not belonging to the rare earths, comes between samarium
and europium as regards the solubility of its Cheap Glucophage salts which are isomorphous
with the corresponding salts of the rare earths, and bismuth thus acts as a
separating element. This fact seems to the author to point to a great
natural law relating to the solubility of the elements of the same series,
He has frequently observed that whatever the method of crystallization
employed, the rare earths arrange themselves in the same order. More-
over, if yttrium is excepted, this is also the order of increasing atomic
veight,as shown in the following table arranged in the order of solubilities :
Lanthanum La i39>o
Cerium Ce ^-^ 140.25
Praseodymium Pr - - 140.6
Neodymium Nd - 144.3 '
Samarium Sm - 1504 |
Earopium Eu = 152.0 !
Gadolinium Gd = 157.3 I
Terbium Tb = 1 59.2