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Chemistry Forums for Students => High School Chemistry Forum => Topic started by: tummy on July 25, 2018, 10:01:32 AM

Title: Predicting Products
Post by: tummy on July 25, 2018, 10:01:32 AM

The question is: "ammonia gas and carbon dioxide are bubbled into water". I initially thought the reaction for this would be
1NH₃(g) + 1CO₂(g) + 1H₂O(l)  :rarrow: 1NH₄(HCO₃) (aq) but I feel like this is wrong and I am not sure what the proper reaction should be or how to get it.

Title: Re: Predicting Products
Post by: chenbeier on July 25, 2018, 11:29:36 AM

It looks quite good. Depending on the amount of ammonia you can also get which one?

Title: Re: Predicting Products
Post by: tummy on July 25, 2018, 11:36:16 AM

I asked a friend and other sources online say that the product could also be (NH₄)₂(CO₃) but I do not understand how they got this.

Title: Re: Predicting Products
Post by: chenbeier on July 25, 2018, 12:01:17 PM

Yes correct that is the other product. Compare yours and this one what is difference.

Title: Re: Predicting Products
Post by: tummy on July 25, 2018, 12:21:13 PM

The other product is just carbonate while I have the bicarbonate anion, but what would cause the bicarbonate to dissociate into carbonate?

Title: Re: Predicting Products
Post by: chenbeier on July 25, 2018, 12:35:21 PM

You dont see the forest, because to many trees.

Calulate all atoms of bicarbonate and the carbonate, what is the difference.

Title: Re: Predicting Products
Post by: tummy on July 26, 2018, 09:31:33 AM

There's 1 carbonate ion and 1 bicarbonate ion in the respective compounds. I still do not quite get it.

Title: Re: Predicting Products
Post by: chenbeier on July 26, 2018, 02:42:51 PM

I mean the whole molecule. NH₄HCO₃ in comparison with(NH₄)₂CO₃

Title: Re: Predicting Products
Post by: tummy on July 27, 2018, 12:14:14 PM

There is 1 NH₄ for 1 HCO₃ in ammonium bicarbonate so 1N, 5H, 1C and 3O atoms and 2 NH₄ for 1 CO₃ in ammonium carbonate so 2N 8H 1C and 3O atoms?

Title: Re: Predicting Products
Post by: chenbeier on July 27, 2018, 01:27:39 PM

And now calculate the difference of the atoms, what is left. Is the hammer now dropping?

Title: Re: Predicting Products
Post by: tummy on July 27, 2018, 01:34:10 PM

The difference is 1N and 3H atoms so another NH₃ molecule, but I don't understand what causes this difference in the mechanisms of the reaction.

Title: Re: Predicting Products
Post by: chenbeier on July 27, 2018, 01:41:42 PM

Yes correct.

Write your first equation again but use two ammonia now. What is the acidity of bicarbonate (hydrogrencarbonate?)

Additinally probably you get 3 other products as well. Think elimination of water in the two carbonates. Also addition of ammonia at carbondioxide. (amids).