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#1
10-31-2011, 04:24 AM
 Duc Guest Posts: n/a
sodium hypochlorite 12.5% --> % chlorine w/w

Our department has a commercial product from formula chemicals, sodium hypochlorite 12.5% w/v. What is the %w/w of available chlorine for this product? Please help
#2
10-31-2011, 05:36 AM
 JohnS Moderator Join Date: Dec 2007 Location: SE Michigan, USA Posts: 9,442 Rep Power: 19
Re: sodium hypochlorite 12.5% --> % chlorine w/w

Quote:
 Originally Posted by Duc Our department has a commercial product from formula chemicals, sodium hypochlorite 12.5% w/v. What is the %w/w of available chlorine for this product? Please help
Ok, 12.5% w/v is 125 g/L of NaOCl. Googling MSDS sheets, density is about 1.2 kg/L, but may vary due to amounts of NaOH, NaCl, and other ingredients left over from processing (and that help stabilize and slow decomposition).

Thus 125 g/1.2 kg = 104 g/kg or 10.4% w/w of NaOCl.

The available chlorine is EXTREMELY confusing. I would count chlorine atoms, however, the industry compares oxidizing behavior of NaOCl vs Cl2 gas. 1 mole of NaOCl is equivalent to 1 mole of Cl2 gas, but has only half the chlorine (one atom vs two per molecule). This is best explained in section 2.1 of this reference, but seems to be the case in everybody's calculations: http://www.omegachem.com.au/docs/mega_handbook.pdf

If you accept this equivalent one mole (74.44 g) of NaOCl is equivalent to 70.91 g of Cl2, so this is 70.91g/74.44 g x 125g/1.2 kg of "available chlorine" 99.2g/kg, (9.92% w/w) based on oxidizing equivalence, but is only half this amount of actual chlorine.
#3
11-01-2011, 04:25 PM
 LexoppyLearma Guest Posts: n/a
sodium hypochlorite 12 5 t chlorine w/w

Quick question....

Is using Thiourea toner without Sodium Hydroxide a stable workable toner??

Thanks,
Dan
#4
11-01-2011, 08:18 PM
 Unregistered Guest Posts: n/a
Re: sodium hypochlorite 12.5% --> % chlorine w/w

Thank you so much, John
#5
10-26-2012, 10:48 AM
 Unregistered Guest Posts: n/a
Re: sodium hypochlorite 12.5% --> % chlorine w/w

As a genera rule of thumb, one gallon of 12% hypo is equivalent to 1 lb of CL2 gas.

1 lb = X gallons x 8.34 lbs/gal. x 12.0 (percent strength)
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100
#6
11-20-2012, 01:21 PM
 Nathan Guest Posts: n/a
Re: sodium hypochlorite 12.5% --> % chlorine w/w

Following the same reasoning is 1 mole of Hypobromous Acid equivalent to 1 mole of Br2.
#7
03-05-2013, 08:04 PM
 Tim Guest Posts: n/a
Re: sodium hypochlorite 12.5% --> % chlorine w/w

Could you please explain how 74.44 eq to 70.91 of Cl2?
#8
03-06-2013, 01:55 AM
 JohnS Moderator Join Date: Dec 2007 Location: SE Michigan, USA Posts: 9,442 Rep Power: 19
Re: sodium hypochlorite 12.5% --> % chlorine w/w

Quote:
 Originally Posted by Tim Could you please explain how 74.44 eq to 70.91 of Cl2?
See the link in post #2. It is based on chemical equivalence in a specific reaction. See section 2.1 of the linked reference. One mole of NaOCl reacts to produce the same amount of I2 gas in this reaction as one mole of Cl2.

This reaction is considered broadly representative of the relative oxidizing powers of the two. Although both are dangerous, a solution of NaOCl in water is easier to handle safely than Cl2 gas.

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