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C

(Numbers refer to paragraphs.)

Calcium
carbonate in carbonate rocks, 206
chloride as a dehydrating agent,

use of, 16, 351, 363

from magnesium, separation of, 198
from strontium and barium, sepa-
ration of, 233

oxalate, ignition and decomposi-
tion of, 200

sulphate, conversion of calcium
oxide to, 200
Calcium determination

by oxalate method, 198-201

in calcium carbonate, as calcium
oxide, 202

in carbonate rocks, 206
in dolomitic limestone, 206
in rock analysis, 378

Calculations, 7, 9, 10, 52, 53

involved in oxidation-reduction
reactions, 258-261

Calibrated volumetric apparatus, 96,

97

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factors, calculation of, 11
tables and data, 13, 415-432
Chemicals, purity of, 24

Chlorate method for separation of
manganese from other ions, 295
Chloride ion determination, theory
of, 143

Chlorides," determination in rock
analysis, "combined, 381
Chlorine

determination in presence of sodium
carbonate, 178

in chlorides, determination of, 150,
169-175, 177, 178

in water, solubility of, 423

Chlorplatinate method
for potassium
[method A], 383

for potassium
[method B], 384
Chromium

determination

determination

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countered, 2

Cleaning glassware, 94

Cleanliness of volumetric apparatus, 94
Cobalt, determination of, 230
Cochineal, 121

Colloidal gels, formation and com-
position of certain, 293
Color indicators, 120, 121

"Combined chlorides" determination
in rock analysis, 381

"Combined oxides" determination in
rock analysis, 375
Combustion

apparatus for carbon in steel, 363
of steels in carbon determination,
temperature for, 360

of steel for carbon, procedure for,
365-368

Common ion effect, 148, 162-165
Complex ion

formation, consideration of, 145,
161, 162

potential of, 247-249
Concentration

of reagents, 25

expression of, 25, 123, 124, 126, 127

Conductivity water, 28
Congo Red, 121
Constant errors, 51, 53
Contact potential, 238
Control, running a, 55
Conversion table

(Numbers refer to paragraphs.)

for liquid measure, 428

for weights and measure, 427-432
Copper

by electro-deposition with alumi-
num, removal of, 208
cathodic overvoltage of, 316
ion on copper, deposition of, 323
sulphate, theory of the electrolysis
of, 311-325

Copper and lead determinations in
brass

methods of, 402
[method A], 403-405
[method B], 406
Copper determination

in an ore, electrolytic, 343-348
in an ore, iodimetric, 308
in brass, 403, 405, 406
interfering elements in, 343
electrolytic, 341-348, 403, 405
residual, 405

treatment of interfering elements
in, 344

Copper-manganese alloys, composi-
tion of, 390

Copper-nickel alloys, composition of,
390

Co-precipitation, 151-155

factors influencing, 153, 156, 157, 159
minimization of, 157

various substances involved in, 151,

152, 183, 184, 189, 198, 208, 226,
255, 289, 374, 378, 401

Counter e.m.f., relationship between
impressed e.m.f. and, 311-314

Creeping, 39

Cresolphthalein, 121

Cresol Red, 121

Crucibles, 19, 46, 47, 81

use and care of platinum, 19, 47, 81

Cupferron, 228

to separate groups of elements, use
of, 228

Current

densities for analytical purposes,
332, 342

density, effect of, 315, 331, 332
source of, 334, 335

Cylinders, use of graduated, 96


Date, importance of, 7
Decantation, 43

Decomposition voltage, theoretical,
314

Dehydrating agents, 16

Delivery time for volumetric appara-
tus, 97

Density
definition of, 74

of water, table of, 99
of dry air, table of, 75
of moist air, table of, 75
Deposition

of ions, differential, 322, 329
of ions, rate and order for electro-
lytic, 310

of metals for analytical purposes,
time for, 333

of two different kinds of ions, sim-
ultaneous, 322

Deposition potential, 323, 329
variable factors of, 330, 331
Deposits, character of cathodic, 332
Desiccator, description and use of, 16
Design of volumetric apparatus, 97
Determinate errors, 51, 53
Determination of moisture, 7, 49
Determinations, indirect, 179, 180
Diacetyl-dioxime, 226

Dibasic acids, titration of, 109
Dichromate ion, potential of, 248
Digestion, 42

Dilution law, application of Ost-
wald's, 163

Dimethyl glyoxime, 226
Diphenyl-endo-anilo-hydro-triazole,

229

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(Numbers refer to paragraphs.)

Electro-chemical reactions, discus-
sion of, 235-257, 310-340

Electrode potential,
definition of, 238

evaluation of, 239 et seq.

Electrodes, use of platinum, 340, 341,
346

Electrode surface, influence of, 315,
317, 318, 321

Electrolysis,

stirring during,

339

theory of, 310-340

Electrolyte, resistance of, 321
Electrolytic

deposition of ions, rate and order
for, 310, 333

separation of various metals, 322,
329

Electrolytic circuit,
improper, 336
proper, 337
practical, 338

Electrolytic determination
of copper, 341-348

of lead in brass, 403, 404
set-up for, 334, 341, 342
technique of, 346
theory of, 310-340
Electromotive force

components of resultant, 238
due to change of charge, 238
Electrons, exchange of, 236
Elements met with, frequency of, 2
Emptying of volumetric apparatus,
filling and, 96

End point, 101

method of detecting, 176
Equilibrium point in weighing, 65
Equivalent solutions, 124
Errors,

consideration of, 50-55
minimization of, 55

Ether

and absolute alcohol mixture, use
of, 233

saturated with hydrochloric acid,
use of, 231
Evaporation, 39, 40

of sulphuric and hydrofluoric acids,
40

Experimental data, recording of, 7

F

Factors, calculations of chemical, 11

Factor values

in gravimetric determinations, use
of, 196

in oxidimetric reactions, calcula-
tions of, 260

standardizing solutions to, 125, 126
Faraday's law, 235, 310

Ferric chloride, isolation of, 231, 232
Ferric ion

by iodide ion, reduction of, 245
reduction of, 245, 270, 376

to ferrous ion, various ways of re-
ducing, 270-278

Ferrous alloys, composition of, 389
Ferrous ammonium sulphate in stand-
ardizing permanganate solutions,
use of, 267

Ferrous and non-ferrous alloys, analy-
sis of, 387-414

Ferrous ion by permanganate solu-
tion, oxidation of, 282-284
Filling and emptying of volumetric
apparatus, 96

Filter paper, 44

macerated, 45

reduction of precipitates due to
charring of, 44, 48, 173, 184, 192
Filtration and washing, 43, 46, 47, 158
Flasks, use of, 96

Floats, use of, 95

Fluxes, classification of, 38

Ford-Williams' method for determina-
tion of manganese, 289

Formic mixture, buffer action of, 213
Formic mixture, preparation of, 211
Franklinite,

composition of, 221

zinc determination in, 221
Funnels, 44, 46

Fusible metals, composition of, 390
Fusion

application and procedure, 38, 183,
373

in rock analysis, decomposition by,
373

kinds of, 38, 376

G

Gahnite, zinc determination in, 221
Gases in water, table of solubility of,
423
Gasometric determinations, 349-368
Gauss' method of weighing, 71
Gelatinous precipitates, formation
and composition of certain, 293

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H

Heat-resisting alloys, composition of,
390

Helianthin, 121

Homogeneity of samples, 34

Hydrofluoric acid, evaporation of, 40
Hydrogen

cathodic overvoltage for, 317, 318
electrode, 105

electrode, normal, 239

ion concentration, calculation of,
166

ion concentration, determination
of, 105

ion concentration, expression of,
102

ion concentration, regulation of,

161-165

ion concentration, rôle of, 159–161
ion on copper, deposition of, 323,
324

in water, solubility of, 423

sulphide generators, 17
sulphide, ionization of, 159
sulphide, removal of, 376

sulphide in water, solubility of, 423
Hydrolysis of salts, 115
Hygroscopy during weighing, 76

I

Igneous rocks, composition of, 371
Ignition, 48, 81, 215

Imperial liquid measure, units of,
428

Impressed e.m.f. and counter e.m.f.,
relationship between, 311-314
Inaccuracy of weights, 73
Indeterminate errors, 51, 52
Indicators, 105, 120, 121
Indirect determinations,

calculations involved in, 179
limitations of, 180

Inflection, point of, 104

"Insoluble matter," in carbonate rock
analysis, 206

Iodide ion

applications of the reducing poten-
tial of, 299-309

by ferric ion, oxidation of, 245
Iodimetric determination of copper,

308

Iodimetric methods, 299-309

Iodine,

applications of the oxidizing poten-
tial of, 299-309
sublimation of, 306

Ionic product of water, 102
Ionization

constants, table of, 167

of acids, table of percentages of, 425
of bases, table of percentage of, 426
of difficultly-soluble salts, 148
Iron

carbon determination in, 358-368
cathodic overvoltage of, 316
determination in brass, 407
determination in a mixture of fer-
rous and potassium sulphates, 279
determination in"combined oxides"
in rock analysis, 376

determination in an iron ore, 280-
282

determination, methods of, 270 et
seq.

from other elements, separation of,
231

in copper determination, effect and
removal of, 343, 344

in iron ore, iron and steel; by ether,
separation of, 232

in limestones, removal of, 206
Iron and steel,

manganese determination in, 287
phosphorus determination in, 193
sulphur determination in, 186
Iron ore, determination of silica, sul
phur and phosphorus, 195

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