Chemical Forums
Chemistry Forums for Students => High School Chemistry Forum => Topic started by: hotshot422 on March 30, 2017, 12:30:30 PM
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Hello,
1. If CaCO3 reacts with Soda (coca-cola for instance), juice and tea which one creates most CO2?
I have troubles with the reactions formulas and understanding why any of these would create any CO2, I think that reacting with juice it creates CO2 because it is acidic. Tea however i expect no reaction. And with coca cola it already has h2co3 in it and therefore not creating any co2 at all, or what would you guys say?
2. This raises the question to me, is this question related too why tooth paste is made of CaCo3???
Thanks a lot in advance for taking your precious time to help a fellow chemistrygeek in need.
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I wouldn't say cola doesn't create CO2 just because it already contains CO2. The gas would certainly be liberated because of the acidic ingredients you mentioned.
You'd need to know the molarity of the acidic contents to get the answer. The drink with the lowest pH is not necessarily the one that contains the most acid. Why not carry out an experiment to find out for sure?
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I would like to mention that im year in 8 and that molarity is not one of my strongest subjects, and probably not really necessary to know so.
1. Does coke create Co2 with CaCo3?
2. Does Tea create Co2 with CaCo3?
3. Does juice create co2 with caco3? And why,
This is what im struggeling with! :( and the tooth paste question is mostly because im interested.
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Hi there, kindly review our forum rules, they're in red, at the top of each page. You agreed to them when you signed up, and they apply to you. You were given a grade 8 assignment by a teacher who believes that you can work to solve this problem, and we'd like to see you try. What have you learned recently on this topic?
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With coca-cola, is there an other effect than acid acting on carbonate?
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Hey, yes
My guess would be H2CO3 + CaCO3 <-> Ca(HCO33)2
So no carbon dioxide is created, although i know that there is CaCO3 in our teeth, and when u put a teeth in a glass of coke it will "melt" in a few days.
With Juice, i do not know what chemistral thing it has, and i would guess no carbon dioxide is created, how would i even see if carbondioxde is created?
With tea, i think there will be no reaction.
This is how good i can do on my own! And then im stuck
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Hey, yes
My guess would be H2CO3 + CaCO3 <-> Ca(HCO33)2
How did you come up with this? Pretty much everything here is made up. Is this from your textbook? You've described calcium bicarbonate, which may not even exist.
So no carbon dioxide is created, although i know that there is CaCO3 in our teeth, and when u put a teeth in a glass of coke it will "melt" in a few days.
Did you perform this experiment? I don't think this is true. Did you read it in a textbook?
With Juice, i do not know what chemistral thing it has, and i would guess no carbon dioxide is created, how would i even see if carbondioxde is created?
You will have to solve that before you even begin, and you seem to have come to some conclusions already. Where did they come from?
With tea, i think there will be no reaction.
Can you support that, based on what tea is made of? Can you use that information to solve the rest of your problem?
This is how good i can do on my own! And then im stuck
I don't see how you're "stuck" you may not be correct, you may have come to the wrong conclusions, you may be ignoring some observations, but if you try to tabulate everything you know, you can write a very good report.
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My guess would be H2CO3 + CaCO3 <-> Ca(HCO33)2
How did you come up with this? Pretty much everything here is made up. Is this from your textbook? You've described calcium bicarbonate, which may not even exist.
Looks to me like karst chemistry (apart from the obvious mistake in the formula).
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Hey again,
Is the chemical substances i should take into account, in tea, juice and coke:
CaCO3 + H2CO3 :rarrow: CaCO3 + H2O + CO2 , would this be a correct formula? Thus CO2 is created,
And the more H2CO3 that reacts with the CaCO3 the more Co2 will be created, so if coke would create most CO2 it would surely be the worst for a "tooth" ?
Juice is also made up by 2 protonic Acid and will also create water and CO2. The more CO2 is created the more of the acid has reacted with the CaCO3
And with tea, i have no idea how to think.
1. Is my 2 thoughts on coke and juice correct?
2. How should i think "chemically" on tea?
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With tea try googling what the acidic species in tea are.
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With coca-cola, is there an other effect than acid acting on carbonate?
Sorry for insisting, but...
Dissolving something in a soda will release the dissolved CO2, and I expect this to overshadow the acid+carbonate reaction.
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Can you explain that a bit further?
1. There is the reaction CO3^2- + 2^H+ => H2O + CO2 ,
2. U said something about dissolved CO2 how do you mean? And is this the explanation why soda is worse for teeths, or juice worse?
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CaCO3 + H2CO3 :rarrow: CaCO3 + H2O + CO2 , would this be a correct formula?
You do know that if something is on both sides of the equation, it can be canceled out?
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Okay yes, that is true. I cancel that out. However,
Is it juice or soda that creates most CO2? thus being worst for our teeths? and how can i determine that, it is the same reaction for both juice and soda. however, Some1 else mentioned something with dissolved CO2? How would that help me explain where most CO2 is created!!
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So basically where i stand,
I know 2H+ + CO32- => CO2 + H2O
for both juice and soda, however, i do not know how determine which of these 2 creates more CO2,
Sorry for bumping the thread, but just to clarify where i stand right now!
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So basically where i stand,
I know 2H+ + CO32- => CO2 + H2O
for both juice and soda, however, i do not know how determine which of these 2 creates more CO2,
Sorry for bumping the thread, but just to clarify where i stand right now!
As has been stated earlier look at the acidic species in each. The pH of a solution is based on the hydronium ion concentration; the greater the pH of the solution the greater the concentration of hydrogen ions in solution.
The reaction 2H+(aq) + CO32-(aq) :rarrow: H2O(l) + CO2 (g) involves hydrogen ions and the carbonate ions from limestone. When these two react together the result is the liberation of water and carbon dioxide. How do you think this relates to the acidity of the beverage? Do you think that a more acidic beverage would be expected to liberate more carbon dioxide upon reaction with carbonate ions?
KungKemi
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Yes of course. The lower pH --> THe more H^+ --> the more CO2 is created --> the worse it is for our teeth.
However, during the lab we made u weren't allowed to measure pH. U just observed the one that "bubbled" the most. And still my teacher said, there is ways to explain why soda would create more CO2. Would a correct answer just be, it is more "acidic". Or should u explain it in any other way?
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Yes of course. The lower pH --> THe more H^+ --> the more CO2 is created --> the worse it is for our teeth.
However, during the lab we made u weren't allowed to measure pH. U just observed the one that "bubbled" the most. And still my teacher said, there is ways to explain why soda would create more CO2. Would a correct answer just be, it is more "acidic". Or should u explain it in any other way?
Were you allowed to take any quantitative measurements, or only qualitative ones?
EDIT: Even if you weren't able to record any quantitative data (like pH or mass measurements) you can always find heaps of secondary data online. I just looked up the pH of coca cola and this was the first link which came up - https://www.sheltondentistry.com/patient-information/ph-values-common-drinks/ - so it definitely shouldn't be too hard to find pertinent information. Just remember to always link this back to the experiment (any qualitative observations and quantitative data.) Make sure to also relate it to basic tooth chemistry - what causes the dermineralisation of tooth enamel (hydroxyapatite)?
All the best,
KungKemi
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Yeah, but preferably without any second data. Since our teacher said, we could explain this with our knowledge in chemistry!
So why is more CO2 in the H2CO3? Is it only beause lower PH in soda?
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Let's take CaCO3 out from the problem for now.
Of the three solutions - juice, tea and coke - which one releases CO2? Why?
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Borek I have already answered that question several times.
The protons from the acids in juice and soda will create carbon dioxide and water.
My question is now 100% how can u decide whether juice or soda creates the most CO2.
Logically since soda contains H2CO3 it would also add more CO2 to the solution, but why in earth would it create more CO2 when reacting with CO3^2-
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Borek I have already answered that question several times.
TBH, I am not convinced you did.
The protons from the acids in juice and soda will create carbon dioxide and water.
No, protons from the acids in juice won't produce CO2. H+ :rarrow: CO2 won't work.
My question is now 100% how can u decide whether juice or soda creates the most CO2.
Have you ever opened a bottle of juice?
Have you ever opened a bottle of coke?
Which have produced more CO2?
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Hmm, have you heard of a law known as Henry's Law? It describes that the solubility of a gas in another gas or liquid is inversely proportional to temperature. Essentially, at a lower temperature a gas or liquid becomes more soluble, however, like dissolving a salt, there is a saturation threshold. What can you tell me about limestone? It evolves carbon dioxide upon reaction with an acid, correct? Let's say that all three beverages are at the same temperature and equal amounts of limestone are added to each. What do you think that the bubbling tells us about the initial concentrations of carbon dioxide in the three beverages?
KungKemi