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Topic: can someone help me with caocl2?  (Read 597 times)

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Offline elifkorkmaz

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can someone help me with caocl2?
« on: May 01, 2020, 05:16:01 PM »
   An electroplating wastewater with an average flow of 4 L s-1 contains 258 mg L-1 NaCN. Determine the amounts of chlorine as Ca(OCl)2 and NaOH required to (a) oxidize the cyanide to cyanate; (b) oxidize the cyanide to CO2 and H2O.
should ı solve it according to cl2?

Offline Borek

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Re: can someone help me with caocl2?
« Reply #1 on: May 01, 2020, 05:34:51 PM »
should ı solve it according to cl2?

Is that what you are asked to do?
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Offline elifkorkmaz

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Re: can someone help me with caocl2?
« Reply #2 on: May 01, 2020, 05:38:44 PM »
yes this is the question, ı have a similar question but on that question amounts of chlorine was asked. so ı cannot understand what to do

Offline elifkorkmaz

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Re: can someone help me with caocl2?
« Reply #3 on: May 01, 2020, 05:44:42 PM »
He asked the all question, my question is should ı solve it according to Cl2?

Offline Borek

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Re: can someone help me with caocl2?
« Reply #4 on: May 02, 2020, 03:53:39 AM »
No, you have to calculate how much Ca(OCl)2 should be used. While the process is equivalent to reaction with just chlorine, you don't use chlorine, but Ca(OCl)2. That's what "chlorine as Ca(OCl)2" means.
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Offline elifkorkmaz

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Re: can someone help me with caocl2?
« Reply #5 on: May 02, 2020, 05:16:54 AM »
I calculated firstly 4L/s x 258 mg/L = 1032 mg/L
then I wrote a reaction like  Ca(OCl)2 + 2H2O <–> 2HOCl + Ca+2 + 2OH-
 2HOCl <-> 2H+ + 2 OCl-
OCl-/ Ca(OCl)2 = 2
mass ratioo = 2x 142.983 (mw of CaOCl)/ 26 = 11 g/g
then; 1032 mg/L x 11 g/g = 11352 mg/s
Is it true?

Offline elifkorkmaz

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Re: can someone help me with caocl2?
« Reply #6 on: May 02, 2020, 05:22:03 AM »
1032 mg/s sorry.

Offline Borek

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Re: can someone help me with caocl2?
« Reply #7 on: May 02, 2020, 05:45:50 AM »
You are asked about amount of substance required to oxidize cyanide, yet there is no cyanide oxidation in your reaction equation.
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Offline elifkorkmaz

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Re: can someone help me with caocl2?
« Reply #8 on: May 02, 2020, 05:58:39 AM »
what should I add

Offline Borek

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Re: can someone help me with caocl2?
« Reply #9 on: May 02, 2020, 06:14:42 AM »
Sorry, won't spoon feed you. You are told what are the processes involved, describe each of them with a reaction equation.
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Offline elifkorkmaz

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Re: can someone help me with caocl2?
« Reply #10 on: May 02, 2020, 06:17:40 AM »
so further reaction should be 2OCl- + 2CN- <-> 2CNO- + 2Cl-
is it true *?

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