DETERMINATION OF CHLORINE IN CHLORIDE, SAMPLE No. ===================================================================== | | Weight sample and tube| 16.1721 | 15.9976 | 15.9976 | 15.7117 | ------- | ------- Weight sample | .1745 | .2859 | | Weight crucible | | + precipitate | 14.4496 | 15.6915 Constant weights | 14.4487 | 15.6915 | 14.4485 | | | Weight crucible | 14.2216 | 15.3196 Constant weight | 14.2216 | 15.3194 | | Weight AgCl | .2269 | .3721 | | log Cl | 1.5496 | 1.5496 log weight AgCl | 9.3558 - 10 | 9.5706 - 10 log 100 | 2.0000 | 2.0000 colog AgCl | 7.8438 - 10 | 7.7438 - 10 colog sample | 0.7583 | 0.5438 | ------- | ------- | 1.5075 | 1.5078 | | Cl in sample No. | 32.18% | 32.20% | | =====================================================================
The concentrations given in this table are those suggested for use in the procedures described in the foregoing pages. It is obvious, however, that an exact adherence to these quantities is not essential.
Approx. Approx. Grams relation relation per to normal to molal liter. solution solution
Ammonium oxalate, (NH_{ 4})_{ 2}C_{ 2}O_{ 4}.H_{ 2}O 40 0.5N 0.25 Barium chloride, BaCl_{ 2}.2H_{ 2}O 25 0.2N 0.1 Magnesium ammonium chloride (of MgCl_{ 2}) 71 1.5N 0.75 Mercuric chloride, HgCl_{ 2} 45 0.33N 0.66 Potassium hydroxide, KOH (sp. gr. 1.27) 480 Potassium thiocyanate, KSCN 5 0.05N 0.55 Silver nitrate, AgNO_{ 3} 21 0.125N 0.125 Sodium hydroxide, NaOH 100 2.5N 2.5 Sodium carbonate. Na_{ 2}CO_{ 3} 159 3N 1.5 Sodium phosphate, Na_{ 2}HPO_{ 4}.12H_{ 2}O 90 0.5N or 0.75N 0.25
Stannous chloride, SnCl_{ 2}, made by saturating hydrochloric acid (sp. gr. 1.2) with tin, diluting with an equal volume of water, and adding a slight excess of acid from time to time. A strip of metallic tin is kept in the bottle.
A solution of ammonium molybdate is best prepared as follows: Stir 100 grams of molybdic acid (MoO_{ 3}) into 400 cc. of cold, distilled water. Add 80 cc. of concentrated ammonium hydroxide (sp. gr. 0.90). Filter, and pour the filtrate slowly, with constant stirring, into a mixture of 400 cc. concentrated nitric acid (sp. gr. 1.42) and 600 cc. of water. Add to the mixture about 0.05 gram of microcosmic salt. Filter, after allowing the whole to stand for 24 hours.