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  #1  
Old 10-16-2015, 07:19 AM
Serge_G Serge_G is offline
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Default Ratio of Lye to vinegar for neutrilizing

Now that I know a lye solution is necessary for sanitize my latest acquisition , I want to make sure that I know how to dispose of the lye solution once I'm done.
I know I need to use 1 lbs. of crystal for 4 gallons of water for the solution but I could not find on the web how many gallons of vinegar will be needed to neutralize the same amount of solution. I want to be on the safe side, that way I can start stockpiling the vinegar.

Last edited by Serge_G; 10-16-2015 at 07:20 AM. Reason: mispelling!!!
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  #2  
Old 10-16-2015, 08:15 AM
Doug D. Doug D. is offline
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Default Re: Ratio of Lye to vinegar for neutrilizing

See my reply here: http://www.castironcollector.com/for...ead.php?t=2723
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Old 10-16-2015, 06:46 PM
Serge_G Serge_G is offline
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Default Re: Ratio of Lye to vinegar for neutrilizing

How about using commercial muriatic acid?
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Old 10-16-2015, 07:32 PM
Dan Farmer Dan Farmer is offline
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Default Re: Ratio of Lye to vinegar for neutrilizing

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Originally Posted by Serge_G View Post
How about using commercial muriatic acid?
Sounds like fire and gasoline to me. Hydrochloric (aka muriatic) acid is some powerful stuff! Mixed with lye, you would have one helluva reaction. Ever mix simple baking soda with vinegar when you were a kid? I may be wrong, but I'd expect something similar but much stronger, along with a lot of heat.
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  #5  
Old 10-16-2015, 08:27 PM
Serge_G Serge_G is offline
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Default Re: Ratio of Lye to vinegar for neutrilizing

I guess the guy in the lab at work has no idea then. Tell me then if it make sense. This is what he came up with his calculations based on 1 lb. lye for 4 gallons of water, that he give on a piece of paper

1- Muriatic acid is 10 mol/liter.

2- 1 lb. of lye is 11.35 mol of NaOH

3 - 11.35 mol of NaOH/10 mol/liter

= 1.135 liter Muriatic acid

I have no idea, what this all means, I'm just trying to be good to the environment without having to buy 15 quarts of vinegar to dilute 4 gallons of solution.
Can you esplane please !
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Old 10-16-2015, 08:38 PM
Dan Farmer Dan Farmer is offline
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Default Re: Ratio of Lye to vinegar for neutrilizing

Oh, I have no doubt that it will work. An acid will neutralize a base. No problem there. I'm just concerned about the reaction.
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  #7  
Old 10-16-2015, 09:36 PM
Jeffrey R. Jeffrey R. is offline
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Default Re: Ratio of Lye to vinegar for neutrilizing

I can clean any cast iron piece that I can find, using ONLY food grade products.

Muriatic acid is not food grade.

You do not need vinegar to neutralize Lye. GOOD old Water, H20

Just what are you trying to do?
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Old 10-16-2015, 09:39 PM
Dan Farmer Dan Farmer is offline
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Default Re: Ratio of Lye to vinegar for neutrilizing

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Originally Posted by Jeffrey R. View Post
I can clean any cast iron piece that I can find, using ONLY food grade products.

Muriatic acid is not food grade.

You do not need vinegar to neutralize Lye. GOOD old Water, H20

Just what are you trying to do?
Water will dilute lye. It won't neutralize it. I suspect that he is trying to dispose of it. Dilution is one way, probably safe with public sewer systems. Not so much for septic tanks, from what I hear.
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Old 10-16-2015, 10:31 PM
Serge_G Serge_G is offline
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Default Re: Ratio of Lye to vinegar for neutrilizing

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Originally Posted by Jeffrey R. View Post

Just what are you trying to do?
Well I'm just trying to do the right thing, I guess, by adding something to the lye to make it sewer friendly. I guess diluting it with water would be best thing.
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  #10  
Old 10-16-2015, 10:38 PM
ShawnE ShawnE is offline
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Default Re: Ratio of Lye to vinegar for neutrilizing

Diluting is safer if you are not well versed with lab techniques (i.e. add HCL VERY slowly and use appropriate protections), but neutralizing NaOH with HCL gives you salt water.
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