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Topic: Chlorine dioxide ph of 6  (Read 3401 times)

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Offline OOOIOOO

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Chlorine dioxide ph of 6
« on: January 06, 2018, 10:05:03 PM »
I am mixing 3 drops of 22.4% aqueous solution of chlorite with 3 drops of 4% hydrocloric acid waited 20 seconds then added 4 onces distilled water measured the result for parts per million of chlorine dioxide to be 40 ppm.

I needed the ph to be 6 so I added. 75 grams of baking soda. It raised to ph to about 6.  Then tested for the chlorine dioxide again with a new test strip which showed almost none.

My question is how can I raise the ph without reducing the chlorine dioxide?

Thanks for any help...



Offline Borek

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Re: Chlorine dioxide ph of 6
« Reply #1 on: January 07, 2018, 03:48:09 AM »
Why do you change pH with baking soda (and in a large quantities)? If it contains anything that can reduce the ClO2, it will.

Mixing concentrated reagents before adding water - especially when the reaction product is obnoxious and dangerous as ClO2 - is asking for troubles, unless you really know what you are doing.
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