552 Gooch and Read — Determination of Chlorine. 



Table II. 



The Electrolysis of Hydrochloric Acid with a Silver Anode plated in 



the Oxalate Solution. 





Chlorine 



taken 



in 



HC1 



grm. 





Current 

 amp. volt 



Increase 

 of anode 

 dried in 

 air bath 



at 



105°-110° 



grm. 



Increase 



of 



anode 



ignited 



grm. 



Loss of 

 dried 



anode 

 on 



ignition 

 grm. 



Apparent 



error in 



chlorine 



when anode 



was 



dried 



grm, 



Apparent 



error in 



chlorine 



when anode. 



was 



ignited 



grm. 



la 



0-0533 



25 



0-5-0-00 2-4 



0-0513 



00502 



o-oon 



— 0-0020 



— 0-0031 



2b 



0-0533 



30 



0-45-0-01 2-4 



0-0529 



0-0520 



0-0009 



— 0-0004 



— 0-0013 



3c 



0-0533 



25 



0-5-0-01 3-4 



0-0513 



0*0501 



0-0012 



— 0-0020 



— 0-0032 



4d 



0-0533 



30 



0-5-0-01 3-4 



0-0523 



0-0517 



0-0006 



—o-ooio 



— 0-0016 



he 



0-0533 



25 



0-5-0-01 3-8-4 



0-0517 



0-0499 



0-0018 



— 0-0016 



— 0-0034 



V 



0-0533 



25 



0-4-0-03 3-8-4 



0-0502 



0-0493 



0-0009 



— 0-0031 



— 0-0040 



*<g 



0-0533 



25 



0-4-0-02 3-8-4 



0-0506 



0-0493 



0-0013 



— 0-0027 



— 0-0040 



a. — The solution became suddenly opalescent and soon thereafter the cur- 

 rent practically ceased, the liquid being neutral to litmus paper. 

 Silver chloride (0-0017 grm.) was recovered from the liquid, and silver 

 was found upon the cathode. 



b. — The electrolysis was interrupted ot the first appearance of opalescence, 

 the liquid being neutral. No silver was found . in solution and none 

 upon the cathode. Iodine, indicated by starch, was liberated when 

 potassium iodide was added to a portion of the solution. 



c. — At the end of the electrolysis the liquid was slightly opalescent and 

 neutral to litmus. Upon the addition of potassium iodide to a portion 

 of it a trace of iodine was set free. In another portion, silver nitrate 

 was without immediate effect. A trace of silver was found upon the 

 cathode. 



d. — At the end of the electrolysis the liquid was slightly opalescent. It 

 was neutral to litmus, but slowly bleached the color. Upon standing 

 it developed acidity. From potassium iodide it liberated iodine equiva- 

 lent to 0010 grm. of chlorine, as was determined by sodium thiosul- 

 phate. A trace of silver was found upon the cathode. 



e. — At the end of the electrolysis the liquid was slightly opalescent. It 

 was neutral to litmus but developed acidity in the course of a half -hour. 

 From potassium iodine a portion set free iodine. In the remainder 

 silver nitrate gave, after standing two days, an amount of silver 

 chloride equivalent to 0*0016 grm. of chlorine. Silver was found upon 

 the cathode. 



/.—At the end of the electrolysis, the liquid was slightly opalescent. It 

 was neutral to litmus, but developed acidity on standing a half -hour. 

 From potassium iodide a small portion set free iodine. From the 

 remainder silver nitrate precipitated silver chloride, which, when filtered 

 off after five days, was found to be equivalent to 0"0035 grm. of 

 chlorine. A trace of silver was found on the cathode. 



g. — At the end of the electrolysis, the liquid was slightly opalescent. It 

 was neutral to litmus, but developed acidity in a half-hour. A small 

 portion of it set free iodine from potassium iodide. Silver nitrate pro- 

 duced in the remainder, after four days, a precipitate of silver chloride 

 equivalent to 0'0036 grm. of chlorine. No silver was found upon the 

 cathode. 



