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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

of
from which the
equal weight of Fe, Cl, and

K, R, Cl,
Os may be sepa. and grains
Na, Co, in a Cuči.

KPaClz,
rated by distilla unattacked,
porcelain cru-

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

Pd.

R, solution, and finally with NH CI, to prevent the Ir20 passing through the pores of the paper.

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The solution contains
The residue consists of

NaPtCl
Ir, 02,

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.

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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
bromine . .
· · · · · · 256

permanganic
carbon ..
· · · · · · 316

phosphoric .
carbonic...

. 318 phosphorous
chloric ..
· · · · · · 268

phosphorus.
chlorine ..

253 pyrophosphoric ...
chlorochromic.. 304 rhodic . . . .
chlorous . . . . 268 ruthenic.
chromic . . . . . .

selenic ....
citric . . . .
:: · · · 356

selenious . . .
common phosphoric. . 376 selenium . .
cyanic . . . . . .

340 silicic .. .
cyanogen . ..

336
silicon

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. .

tannic hyposulphurous.

tantalic . . . . iodic . . . . .

tantalum iodine

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

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Acid, uric . . . . . . . :

359
vanadic . . . . . 243, 311
Acid-radicals, analytical classifi-

cation of . . . . . . 251
general examination for . 413
preliminary examination for 404
schemes for detection of,

278, 314, 362, 384
special tests for . . . . 405
Affinity . . . . . . . 36, 43
Alkalies . . . . . . . . 71
Alkaline earths · · · · 82
Allotropy . . . . . 26, 28, 34
Alloys, treatment of ...

. 415
Aluminates . . . . . 109, 304
Aluminium . . . . .
Ammonia . . . . . . 78, 365
Ammonium. ... 78
Analysis of mixed salts . . . 415

of simple salts

method of . .385 et seq.
Anhydrides . . . . .267 et seq.
Antimony. .....

detection of . . . . 200
Antimonyle. ...
Aqueous fusion .... 391
Arsenic . . . . . . 12

detection of ..
Arsenides . . . . .
Atomic theory .. .

weights . . .
Barium . . . . . .
Baryta . ........ 58
Basic bodies, organic . . . . 143
Basic elements. . . . 3 et seq.
Basic radicals, reactions and

salts of . . . . 67 et seq.
aluminium . . . . . 108
ammonium . . .
antimony . . .

. 199
arsenic . . . .
barium. . .
bismuth . .

181
cadmium.

154
calcium . . .
cerium . . .

102
chromium.

111
cobalt
copper · · ·

157
didymium.

. . 105
erbium . . .
ferric .. . .. 123

.....

Page
Basic radicals (continued)

ferrous . . . . . . . 120
glucinum , . . . . . 107
gold . . . . . . . . 232
hydrogen.. . 254

et seq.
iridium. . . .

227
iron . . . . .
lanthanium .
lead. ..
lithium...
magnesium . .
manganese . . .
mercurio . . . .
mercurous . . . . . 170
mercury .
molybdenum.

238
nickel...

135
niobium ...
osmium. ...

230
palladium ...
pelopium ...
platinum .. ..

219
potassium . . ..
rhodium . . .
ruthenium. . . . 225
silver . . . .

163
sodium . . .

75
strontium. .

86
tantalum .

316
terbium. . .

99
thorinum .
tin . . .

191
uranium .

116
vanadium ... 242
yttrium. .
zinc . . .

zirconium.
Basic salts . .
Bismuth . .
Borax . . . . .
Borides . . ..
Boron . . . . . ..
Cadmium ....
Calcium
Carbides . . . . . ..
Carbon . . .
Carbonic acid gas. . .
Cerium . . . . . . . .

102
Chlorine . . . . . . . . 18
Chromium . . . ...
Chromyle, notes. · · ·
Cobalt . . . . . . . . . 8

210

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Combination, laws of . . 36 et seg. | Mercury ....

11
by volume... 37 | Method, importance of ... 387
by weight . . Molybdates . . . . .

310
Copper . . . . . . .

Molybdenum . . . . 310
Crystallization .

. Monatomic radicals...
purification by . 49 Monobasic radicals. ... 46

water of ... Morphine. ....... 143
Cyanides. · · · · · ·
Cyanogen . .....

Nickel . . . . . . . . . 9

Niobium . .. ..
Decomposition, double.

Nitrates . . . . . 371
Diamond . . . . . .

Nitrites . . . . . · ·

370
Didymium . . . . .

Nitrogen . . . . . . . .
Distillation . . . . . .

Nitrohydrochloric acid ... 372
Distilled water..

Nomenclature . . . . . .

45

Notation . . . . . . . . 38
Elective affinity . . . . . .

the resultant of many forces Organic acid-radicals . . 319
Elements, classification of .. Organic bases . . . .. 143
Equivalent volumes .... Osmiates . . . . . .

230, 308
weights. .... 37 Osmium . . . . . .

Oxalates . . . . . . . 323
Fluorides . .

263
Oxides . . . . .

. 281
Fluorine . . . . . . . .

Oxidizing action .. . 112
Fusion . . . . . . . .

. 394
. | Oxygen . . . . . . . . 23

Oxy-salts . . . . . .
Glucinum . . . . . . . .

109
Gold . . . . . . . . .

Palladium . . . . . . .

12
Graphite . . . . . . .

Pelopium . . . .

119
Group reagents, use of · · · 388

Pentathionates ...

Perchlorates. ..
Hydrates . . . . . . . . 282 Perchromates . .

307
Hydration, water of..55, 281 Periodates . . . . . . . 274
Hydrogen . . . . . . . . 14 Permanganates . . . . . . 308

Phosphates. ...
Insoluble substances . 392, 406 Phosphides ....

. . . . 366
Iodides. . . .

375
. . .
. . 260

Phosphites ...
Iodine . . . . · ·
21 Phosphorus . . .

32
Iridiates . . . . . . 230, 308 Platinates . . . . . . . .
Iridium . .

227 Platinum . . . . . . . .
Iron . . . . . . . . .

Potassa . . . . . . . .

Potassium. . . . . .
Lanthanium .....

Precipitation . . . .
Law of definite proportion

Preliminary examination
Laws of combination . . . . 36 acid-radicals . . . .
Lead . . . . . . . .

Preliminary examination for
Lime . . . . . · · · ·

basic radicals . . . . . . 391
Lithia . . . . . . . .

Purple of Cassius . . . . . 233
Lithium . . . . . . . . 5 Pyrophosphates ...... 376
Magnesium . . . . . . . 6 | Qualitative analysis, method of. 385
Manganates . . . . . . . 307 preparing solutions for 392, 408
Manganese . . . . . . . 8 1 Quinine . . . . . . . . 144

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