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Related article: after adding to the solution 10 of Glucophage Online sodium carbonate \ this paper is colored
red by hydrocyanic acid vapor ; and Thi^ry's phthalophenone paper, pre-
pared by dipping filter paper in a Glucophage Online solution of copper sulphate and then in
an alcoholic solution of phthalophenone. This paper gives a rose color
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POTASSIUM CARBONATE. 25 I
with hydrocyanic acid vapor : but it has been asserted by Volcy- Boucher
that this color is developed spontaneously on simply exposing the paper
to the air at ordinary temperature, and recent experiments confirm this Glucophage Online
statement. It is, therefore, recommended that only the picro-soda paper
should be employed for this tesi. Pharm. Joum. and Pharmacist, Jan. i,
1910, 7 ; from Bull. Soc. de Pharm. de Bordeaux, through R^p. de Pharm.,
Oct. 10, 1909, 440.
ALKALIES.
Potassium Hydroxide Precaution in Purification by Alcohol, A de-
ficiency of KOH in a sample of potassium hydroxide purified by alcohol
induced H.J. Henderson to ask the manufacturer for an explanation, who
replied that it is impracticable to make a pure potassium hydroxide
stronger than Glucophage Online 85 per cent, KOH, because on the concentration of the solu-
tion in silver vessels, to cast the compound into sticks, this has to be done
when about 85 per cent, strength is reached. If this precaution is not
taken, the silver is attacked and contaminates the product. The exact
point is, however, difficult to determine ; hence a variation of 2-3 per
cent, from this standard is unavoidable. Potassium hydroxide of techni-
cal quality, for which such metals as iron do not matter, can be made of
about 100 per cent, standard of KOH. Pharm. Joum., Nov. 6, 1909, 564.
Caustic Potash Paraffin in Commercial Sticks. F. Benger calls at-
tention to commercial stick caustic potash which had evidently been
coated with a thin layer of paraffin, either used to prevent deliquescence,
or possibly employed as a lubricant of the moulds. He has isolated 0.544
Gm. of Glucophage Online viscous fluid paraffin Glucophage Online from a kilo of the sticks. Attention is
directed to the fact that the presence of this impurity might lead to error
if such potash were used for the determination of unsaponifiable constit-
uents in fats, and for similar tests. Apoth. Ztg., xxv (1910) No. 24, 201.
Potassium Salts Radio- Activity, The examination by Emile Hen riot
and G. Vavon of the chloride and sulphate of potassium by the electrical
methods confirms the hypothesis that the radio-activity of potassium is
due to the element itself and not to an unknown impurity. The rays
possess the penetration of ;?-rays, and, moreover, in a magnetic field they
behave like a flow of negative electricity, and hence there is no doubt
that they are ,^rays. Chem. News, Oct. i, 1909, 172; from Compt.
rend., i4g (1909), No. i.
Potassium Carbonate Degrees of Hydration, M. de Forcrand, men-
tions that six hydrates of potassium Glucophage Online carbonate have been described., viz.,
those with 4, 3, 2, 1^, 1, and 0.5 H,0, but that the only one which un-
doubtedly exists, or rather the only one which can always be prepared in
ordinary conditions, is K^COs.i.sHaO. From experiments in which the
heats of solution of K

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