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Topic: Dissolving Eggs  (Read 24424 times)

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Jaques

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Re:Dissolving Eggs
« Reply #15 on: April 02, 2006, 07:23:25 PM »
Wow...so this is organic chem? awhole lot different than hs chem.. That's for sure.

Well its gonna take some time for me to absorb and understand this . :o

but wow, thanks. I think i have a better understanding of the reaction! Now to learn the scientific part.

Offline constant thinker

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Re:Dissolving Eggs
« Reply #16 on: April 02, 2006, 08:26:41 PM »
Yea, I realized a long time ago organic chem is pretty in depth. I understand now. Thank you everyone I understand now. Borek and Alberto_Kravina, I've given you both scooby snacks for helping me to understand organic acids better.
« Last Edit: April 02, 2006, 08:40:13 PM by constant thinker »
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Online billnotgatez

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Re:Dissolving Eggs
« Reply #17 on: April 04, 2006, 04:08:19 AM »
« Last Edit: April 04, 2006, 05:20:55 AM by billnotgatez »

Offline k1027iwi

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Re:Dissolving Eggs
« Reply #18 on: April 13, 2006, 11:18:10 PM »
You all seemed to have left out the generation of oxygen in this reaction.  Oxygen must have been generated as well as carbon dioxide, since the only way the chemical reaction could be balanced involves oxygen:

2Ca(CO)3 + 4CH3COOH --> 2Ca(COCH3)2 + 4CO2 + 2H20 + 3O2

By the way, acetic acid is denoted: HOAc, not HAc; Ac denotes O=CCH3

Offline k1027iwi

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Re:Dissolving Eggs
« Reply #19 on: April 13, 2006, 11:23:27 PM »
by
Ac denotes O=CCH3

I meant the CH3CO-, I'm sure it could also be used to denote the CH3COO-
but acetic acid is more commonly denoted as HOAc in journals and articles.  Sorry, I'm just picky :P

Offline pantone159

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Re:Dissolving Eggs
« Reply #20 on: April 14, 2006, 12:31:48 AM »
I meant the CH3CO-, acetic acid is more commonly denoted as HOAc in journals and articles.

I would like to think that Ac always means the same thing in regards to 'acetate'.  HOAc for acetic acid is what I have noticed most often.  It is bad enough that another element already has that symbol.  Is there an official meaning to 'Ac' in chemistry?  (Other than actinium!)


Online billnotgatez

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Re: Dissolving Eggs
« Reply #21 on: April 14, 2006, 04:11:09 AM »
k1027iwi

Since you are being the picky point person could you answer my question?

Quote
Is the combining of Calcium carbonate and Acetic acid considered a weak base - weak acid reaction?
[end quote]

Offline k1027iwi

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Re: Dissolving Eggs
« Reply #22 on: April 14, 2006, 08:18:06 AM »
billnotgatez.

Yes, this reaction would be considered a weak acid - weak base reaction, considering that the pH of calcium carbonate is about pH 8, which is pretty weak.

btw, before anyone catches my idiocy with the equation, I realized I made a mistake:

2 CH3COOH(aq) + CaCO3(s) -->  Ca+2(aq) + CO2(g) + 2 CH3COO-(aq) + H2O(l)

There.  Now we're all happy  ;)

Offline Borek

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Re: Dissolving Eggs
« Reply #23 on: April 14, 2006, 08:28:49 AM »
the pH of calcium carbonate is about pH 8, which is pretty weak.

Can you elaborate on what you mean?
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Offline Alberto_Kravina

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Re: Dissolving Eggs
« Reply #24 on: April 14, 2006, 08:39:20 AM »
Ksp CaCO3 [2.8 10-9]. Pretty insoluble salt, I wonder how you calculated the pH...

Maybe you meant the pH of calcium acetate, but also in this case you have to know the concentration..

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Re: Dissolving Eggs
« Reply #25 on: April 16, 2006, 03:12:50 PM »
Alberto_Kravina

Do you consider the reaction between Calcium carbonate and Acetic acid a weak base - weak acid reaction?


Offline Alberto_Kravina

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Re: Dissolving Eggs
« Reply #26 on: April 16, 2006, 04:19:00 PM »
Yeah...acetic acid is a pretty weak acid (pKa=4,75), carbonate anion (which is the base in this case) is a medium-strong base (since it is the conjugated base of carbonic acid). The carbonate anion is not such a weak base, though....

Offline Borek

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Re: Dissolving Eggs
« Reply #27 on: April 16, 2006, 04:29:52 PM »
Problem with carbonic acid is that it is probably stronger than we think, just the Ka we observe is influenced by the H2O + CO2 <-> H2CO3 equilibrium - as it is moved to the left real concentration of H2CO3 is much lower than used in Ka expression.
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