108 R. B. Riggs — Separation of Magnesium Chloride, etc. 



without the 



benzyl chl< 



)ride. Otherwise the conditions and 



methods were the same. 















Error in corr. 





Weight of 



Weight of 



Corr. weight of 



weight of KC1 



Weight of MgO 



KC1 taken. 



KOI found. 



KC1 found. 



found. 



found in KOI. 



grm. 



grm. 



grm. 



grm. 



grm. 



(20) 0M079 



0-1078 



0-1082 



0-0003 + 



trace 



(21) 0-1081 



0-1074 



0-1079 



0-0002 — 



trace 



(22) 0-1081 



0-1076 



0-1080 



0-0001 — 



0-0004 



(23) 0-1080 



0-1074 



0-1079 



o-ooo I — 



0-0003 



(24) 0-1080 



0-1071 



0-1079 



o-oooi — 



0-0004 



(25) 0-1076 



0-1061 



0-1070 



0-0006 — 

 Error in corr. 



0-0002 



Weight of 



Weight of 



Corr. weight of 



weight of NaCl 



Weight of MgO 



NaCl taken. 



NaCl found. 



NaCl found. 



found. 



found in NaCl. 



grm. 



grm. 



grm. 



grm. 



grm. 



(26) 0-1582 



0-1576 



0-1583 



o-oooi + 



trace 



(27) 0-1591 



0-1576 



0-1582 



0-0009 — 



trace 

 Error in corr. 



Weight of 



Weight of 



Corr. weight of 



Corr. weight of 



weight of MgO 



MgO taken. 



MgSCu found. 



MgS0 4 found. 



MgO found. 



found. 



grm. 



grm. 



grm. 



grm. 



grm. 



(20) 0-0419 



0-1250 



0-1245 



0-0415 



0-0004 — 



(21) 0-0418 



0-1262 



0-1257 



0-0419 



0-0001 + 



(22) 0-0835 



0-2508 



0-2504 



0-0835 



00000 



(23) 0-0827 



0-2498 



0-2493 



0-0831 



0-0004 + 



(24) 0-1665 



0-4996 



0-4987 



0-1662 



0-0003 — 



(25) 0-1667 



0-5005 



0-4995 



0-1665 



0-0002 — 



(26) 0-1669 



0-5009 



0-5001 



0-1667 



0-0002 — 



(27) 0-1662 



0-4980 



0-4973 



0-1658 



0-0004 — 



It is evident that the benzyl chloride is not needed, further 

 that its presence in the solution is harmless. 



Summary. — In separating magnesium chloride from the 

 chlorides of sodium and potassium, the treatment is as follows : 

 evaporate the solution nearly or quite to dryness. Dissolve 

 the residue in as little water as possible and add a few drops of 

 hydrochloric acid. Then add 30-40 oc of amyl alcohol and 

 expel the water by bringing the alcohol to the boiling. Con- 

 tinue the boiling until the volume of the solution is reduced 

 to 10 cc or even considerably less. In filtering it is of great 

 advantage to use a perforated crucible and an asbestus felt and 

 to filter under pressure. In case the total chlorides exceed 

 0*2 grm. it may be advisable to decant the liquid, wash the 

 residue, redissolve and repeat the precipitation. If this be not 

 done the precipitate should be redissolved with the least possi- 

 ble quantity of water, a few drops of hydrochloric acid added 



