Is the reaction between a chalk and hydrochloric acid always exothermic? How so?

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asked Jul 9, 2024 19.7k views

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Alex Paramonov · Answer 1 · 2024-07-15T18:12:06+0000

The most part of Chalk is Calcium Carbonate (CaCO3). When this reacts with Hydrochloric acid, we have production of Carbon dioxide, Calcium Chloride and Water.

CaCO3 + 2HCl → CO2 + CaCl2 + H2O

Is the reaction between a chalk and hydrochloric acid always exothermic? How so?

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