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APPENDIX TO TABLE FOR THE ANALYSIS OF GROUP II.,
Exhibiting the general outline of the method of dealing with the metals Pd, Ir, R, Ru, and Os, which, together with some Fe and Cu, are found in platinum ore.
The mineralis dissolved in a retort by means of a mixture of 5 parts of the most concentrated HCl with 1 part of fuming HNO2, and the acid which distils over as the liquid boils, collected in a receiver; the distillate is returned and redistilled.
The distillate The syrupy residue in the retort is then filtered off from certain dark will contain the steel-coloured grains, which are not acted upon by the acid.
Os as Os, 04.
Saturate with The insoluble The concentrated filtrate is mixed with about twice its solution of KHO; grains are called bulk of EHO, and then with a warm solution of KCI add EHO, and Osm-iridium, | until no more precipitate is formed. It should be allowed warm gently, and contain Os.) to rest for some time, filtered, and washed with weak when a fine red
EHO containing KCI. crystalline pre- These are powcipitate forms, dered in a steel
| which is KOSO:
The yellow or
The solution contains the R, Pd, and mortar, and red crystalline
some Ir, together with the Fe and Cu. fused with a precipitate con
It is evaporated to dryness, the mass mixture of equal parts of KHO
sists of KPtClą and KCIO,. The mass is
digested with concentrated nitrohydro
chloric acid, KCl added, and the evatreated with water.
and KIrClz, with traces of
poration repeated. The mass is then K, R, Cl, and
washed with alcohol. The solution
KPaCiz. contains KOSO The residue
It is gently
The residue, consisting and KRuo, consists of heated with an will contain
K, R, Cl,
and KIrCla, tion with nitro- which must be
cible until the is fused with K, O, and the mass hydrochloric again fused.
mass becomes boiled with H, O. acid.
quite black. It is - then boiled with
The residue con The solution is water acidified with HCl, and the residual black
tains a portion of acidified with HCl, powder of Pt and Ir, washed. It is then digested
Ir, 03. and a piece of pure with dilute nitrohydrochloric acid, in order to ex
Zn introduced. tract part of the Pt; and this solution being pre The black precipitate is washed and served, the insoluble residue of Pt (yet undissolved)
treated with HNO3. and Ir, o is mixed with NaCl and concentrated nitrohydrochloric acid, and evaporated to dryness. Water is then added, to dissolve the Ptch, and the
The residue The solution
contains the consists of the solution filtered, the filter being washed with NaCl
R, solution, and finally with NH CI, to prevent the Ir20 passing through the pores of the paper.
The solution contains
and some Ir, which may which may be reduced |
be separated by a repetito metal by heating in tion of the ignition with a current of H.
Na, C03, &c. &c.
The examination for acid-radicals is to be conducted in accordance with the plans given on pp. 413, 414.
Suitable mixtures for analysis may easily be made. For instance, at first two salts should be taken containing a common acid-radical and different basic radicals belonging to different groups; then a mixture may be made, the basic constituents of which are four in number, two belonging to one group, and two to another. The student should then exercise himself in effecting the more difficult and delicate methods of separation, gradually increasing the number and variety of the basic and acid-radicals to be detected. Trials should also be made with mixtures of soluble and insoluble salts, with alloys, with salts incapable of remaining dissolved in the same solution, and with some of the substances met with in commerce or in common life.
Page Acid elements ...
Acid-radicals (continued) Acid-radicals, reactions and salts
niobium. . . . . . . 119 of ..... 248 et seq. nitric . . . . . . . . 371 acetic. . . . . . . .
nitrogen . . . . . . . 364 antimonic . . . . 207, 382 nitrous . . . . antimony . . . . . 369 osmic .. .
308 arsenic . . . . . . 367 oxalic .. .
. 323 arsenic . . . . . .
oxygen .. .
. 281 arsenious . . . . 380 pelopium . . . . . . 333 auric . . . . 234, 308 pelopic ..... 333 benzoic . . 351 pentathionic.
294 bismuthic .. 308 perchloric..
270 boron ...
· · · · · 316 perchromic.. boracic ...
. 326 periodic . . . . 274
. 318 phosphorous
253 pyrophosphoric ...
selenious . . .
340 silicic .. .
316 ferric. .. . .. 307 stannic . . . . . . . . 197 ferricyanogen . ... 346 succinic . . . . . ferrocyanogen . .
344 sulphantimonic.. 208, fluorine . . . .
sulpharsenic .. 219, 382 fluosilicic ..
317 sulpharsenious .. gallic . . . .
sulphocarbonic . hydric...
sulphotungstic.. hypochlorous ..
sulphur ... hyponitric ...
sulphuric ... hypophosphorous.
sulphurous ... hyposulphuric. .
tantalic . . . . iodic . . . . .
tartaric, ... iridic. ....
telluric. lactic . . . . . .
tellurium manganic ....
tellurious . . . metantimonic . . . 207, 382 tetrathionic. . . metaphosphoric .. 376 titanic . . . metastannic ....197 titanium . . . . .
316 molybdic . . . . . . 310 trithionic . . . . . . niobic . . . . . . . 119 tungstic . . . . . 237, 309
. . . 333
cation of . . . . . . 251
278, 314, 362, 384
of simple salts
method of . .385 et seq.
detection of . . . . 200
detection of ..
weights . . .
salts of . . . . 67 et seq.
. . 105
ferrous . . . . . . . 120
Molybdenum . . . . 310
. Monatomic radicals...
water of ... Morphine. ....... 143
Nickel . . . . . . . . . 9
Niobium . .. ..
Nitrates . . . . . 371
Nitrites . . . . . · ·
Nitrogen . . . . . . . .
Nitrohydrochloric acid ... 372
Nomenclature . . . . . .
Notation . . . . . . . . 38
the resultant of many forces Organic acid-radicals . . 319
Oxalates . . . . . . . 323
Oxidizing action .. . 112
Oxy-salts . . . . . .
Palladium . . . . . . .
Pelopium . . . .
. . . . 366
227 Platinum . . . . . . . .
Potassa . . . . . . . .
Potassium. . . . . .
Precipitation . . . .
Preliminary examination for
basic radicals . . . . . . 391
Purple of Cassius . . . . . 233
. . 376