Chemistry Forum

Hi,

What is produced when you mix (NH₄)₂SO₄ + CaCO₃ ?
Also what is produced when you mix (NH₄)₂SO₄ + CaCO₃ + H₂O?

I think CaSO₄ is one of the products of both reactions.

Thanks,
Shona

I don’t think anything produced when you mix two solids (NH₄)₂SO₄ and CaCO₃. If you heat it up, and then CaSO₄ can form. The same reaction happens when you mix them in water:
(NH₄)₂SO₄ + CaCO₃ --> NH₃ + CO₂ + CaSO₄
Certainly NH₃ + CO₂ can form (NH₄)₂CO₃ or NH₄HCO₃, but ammonium carbonate and ammonium bicarbonate can easily degrade to NH₃ and CO₂ especially when heated.

Thanks very much!

what is the product when CaCl₂.2H₂O mix with HCl?

No reaction and no product in this case.

For those actually trying to prepare Ammonium Carbonate, I recall reading that the production of Ammonium Carbonate starts with a fresh precipitate of CaCO₃.

Good luck.

Isn't it easier to prepare Ammonium Carbonate simply by direct reaction of ammonia and carbon dioxide?

2 NH₃ + CO₂ + H₂O = (NH₄)₂CO₃

The direction reaction of carbon dioxide with ammonia in aqueous solution is also the way to create Amomium Hydrogencarbonate NH₄HCO₃. Per my source (Concise Encyclopedia Chemistry by DeGruyter, page 64), heating a mixture of:
(NH₄)₂SO₄ + CaCO₃ --> CaSO₄ + (NH₄)₂CO₃

produces the compound. In the process, ammonia sublimes off together with NH₄HCO₃ and Ammonia Carbamate (which is formed from the reaction of heating dry ammonia and CO₂).

I would just add how you heat the mixture maybe important as our compound (NH₄)₂CO₃ decomposes completely at 58C (into H₂O, CO₂ and NH₃) and NH₄HCO₃ starts to decompose in the range 40C to 60C.

Good luck.

This is the result of the equation.

(NH₄)₂SO₄ + CaCO₃ + H₂O → CaSO₄ + CO₂ + H₂O + 2NH₃

The same products: CaSO₄, CO₂, H₂O, and NH₃.

10 year old thread