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DCHAS-L Archives ยท Post dated October 10, 2019

[DCHAS-L] Iodine clock reaction waste

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Date: Oct 10, 2019 14:04 UTC

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From: Pam Auburn <aubu**At_Symbol_Here**HOTMAIL.COM>

Subject: [DCHAS-L] Iodine clock reaction waste

Date: Oct 10, 2019 15:19 UTC

Reply-To: ACS Division of Chemical Health and Safety <DCHAS-L**At_Symbol_Here**PRINCETON.EDU>

In-Reply-To:  

Demystify: 


I was wondering if anyone here has experience with this reaction and the proper waste disposal 

IO3- + 3 HSO3- --> I- + 3 SO4-2 + 3 H+

IO3- = 8 I- + 6 H+ --> 3 I3- + 3 H2O

I3- + HSO3- + H2O --> 3 I- + SO4-2 + 3 H+

2 I3- + starch --> starch-I5- complex (blue)



I saw from something published in 1996 "For disposal of waste products, combined all of the solutions used in this experiment with solid sodium thiosulfate until the mixture is no longer blue. The resulting clear mixture can then be discarded by flushing down the drain upon the addition of water."

Mitchell, R.S. Iodine Clock Reaction. J. Chem. Educ., 1996, 73 (8), 783.

Is this still acceptable? 


Thanks 

Pamela Auburn, PhD
2041 Branard
Houston TX 77098

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