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Old 07-24-2014, 05:56 PM   #21
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Salt + Vinegar = Hydrochloric Acid. It's the acid that does the cleaning, the agitation of the salt helps.
No wonder my gums are bleeding after I eat these

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Old 07-24-2014, 05:59 PM   #22
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No wonder my gums are bleeding after I eat these




I wondered why those chips taste like pennies. Huh.

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Old 07-24-2014, 06:02 PM   #23
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Vinegar is already pretty acidic. I doubt that adding some salt would increase it's acidity much. But who knows. Sounds like a good experiment for someone with a pH meter. Not sure how well vinegar dissociates to make the HCl.

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Old 07-24-2014, 06:27 PM   #24
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The pKa value for HCl is less than the pKa for acetic acid. The reaction is proceeding in the wrong direction (the dissociation of a hydrogen ion from acetate is the limiting factor). When mixing the two you end up with acetic acid and sodium chloride in solution not HCl. HCl plus sodium acetate in molar equivalents would yield acetic acid.

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Old 07-24-2014, 07:03 PM   #25
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Not molar equivalents!...........

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Old 07-24-2014, 08:12 PM   #26
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A little googling pulled up this formula:
HC2H3O2 + NaCl ---> HCl + NaCH3O2
(vinegar) + (salt) ---> (hydrochloric acid) + (sodium acetate)

However, I am not a chemist and don't profess to be one. This formula may be incorrect. I know it cleans copper very, very well though.

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Old 07-24-2014, 08:32 PM   #27
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Grain + yeast = beer

That's the extent of my chemistry knowledge.

Just ask my AP chem teacher ha


Sent from myPhone

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Old 07-24-2014, 08:59 PM   #28
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Quote:
Originally Posted by The_Bishop View Post
A little googling pulled up this formula:
HC2H3O2 + NaCl ---> HCl + NaCH3O2
(vinegar) + (salt) ---> (hydrochloric acid) + (sodium acetate)

However, I am not a chemist and don't profess to be one. This formula may be incorrect. I know it cleans copper very, very well though.
Your equation is correct in the sense that it is a balanced equation (ignoring the missing carbon in the sodium acetate). The problem is thermodynamics. The thermodynamics of the above equation are not favorable and it will proceed in the reverse direction. The pKa of an acid is proportional to gibbs free energy (free enthalpy)

To the original poster. The composition of of oxyclean is mostly sodium carbonate/sodium percarbonate. When divalent cations (Ca2+ Mg2+) are mixed with carbonates in a high pH high temperature environment a precipitate is formed assuming you have a quantity exceeding the solubility in those conditions. This would happen in water containing high levels of Calcium and Magnesium ions. The solubility decreases as pH increases and temperature increases (inverse solubility). This means that using a cold acidic solution will remove the carbonate precipitate.
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