CaCO3 and HCl

CaCO3 + 2 HCl = CaCl2 + H2CO3

Calcium Carbonate + Hydrochloric Acid = Calcium Chloride + Carbonic Acid

[madalchemist]

I'm late but this is a reaction between Calcium carbonate and hydrochloric acid.

This reaction produces carbon dioxide, water, and calcium chloride.

This is a neutralisation reaction (produces a neutral salt), and it is exothermic (releases heat), so if you were holding the flask, you will feel that the flask is hot.

The person wanted to collect the carbon dioxide, so he put a balloon in the opening of the flask to prevent carbon dioxide from escaping to the air.

This is a very great method to collect carbon dioxide and prevent it from escaping to the air, but it is not very accurate, but it is still great just for collecting the gas.

A more accurate method to measure the volume of the gas would involve using a gas syringe and a bung.

Anyway, we see the carbon dioxide in the form of "bubbles", "effervescence", or "fizzing", which appear on the surface of the liquid. This is seen in ANY reaction where the solid has "carbonate" and combines with an acid.

How do we know if the reaction is finished? If there is no more "bubbles" or "fizzing", then the reaction has stopped.


In this method, we could also say that the balloon stops becoming bigger when the reaction finishes.

After this reaction has finished, we are left with calcium chloride and water in the flask.

What if we want to obtain the calcium chloride?

First, we would have to remove the balloon using any method and assuming the student wanted to collect the carbon dioxide, we have to tightly block the end of the balloon to prevent the gas from leaking and escaping.

Why would the reaction end though?
Logically, because maybe one of the reactants, either calcium carbonate or hydrochloric acid, is used up.

If it's the solid that has finished, then all solid should have disappeared.

If it's the liquid that has finished, then we should be left with a remaining solid and few water.


After removing the balloon, we have our calcium chloride plus water solution.

We can obtain the calcium chloride by filtration.

Filtration:
(in short, we pour the solution of calcium chloride and water in a filtering paper held by a filtering funnel and make sure there is something beneath the funnel to collect the solution that will fall. Water is small enough to pass so what will remain is calcium chloride.)

Wash the calcium chloride with distilled water (since it's a neutral salt, it won't react with water or anything), then dry gently in a small oven or between 2 filtering papers.


hope this helps someone in the future :)

I learned this from IGCSE. It is a very good education system and teaches you a lot, but kind of stressful.

You can also try this method in real life assuming you are following safety precautions too.

Chemistry is very fun. You can obtain anything from anything using any method.

Remember, if you love it, difficultly of the subject won't be a major problem.

[praveenks]

Thank you for this experiment. This helped me in understanding the concept effervescence better.

[jakenbaked]

No carbonic acid. It produces CO2 CaCl2 and H2O

[angeladelara]

Question: By any chance, do you still remember the molarity of HCl acid you used? Also, how much HCl and CaCO3 did you use?

[namanpreetkaur]

thanks ..This helped me in understanding the concept effervescence more easily

[selenium.]

CaCO3 + 2 HCl --> CaCl2 + H2O + CO2

[trinityy-]

So, this is my science work... I’m 11 and I’m playing this on 2x speed to get to do my work quicker today

[aacmbirdzilla]

Question, was the HCl solution at 1 M or 2 M? And how many grams of CaCo3 did you use?

[krstev]

Hi, can someone tell me the product is CO2 and not CO or CO3

[yuygi]

Someone explain. I’m doing my homework. What does he pour in from the baloon

[wahyukurniawan]

Please everyone who see my coment help me, what is the name of this reaction?