You can use hydrochloric acid (HCl) to distinguish between calcium chloride (CaCl₂) and solid carbonate (likely calcium carbonate, CaCO₃). Here's why:

* Calcium chloride (CaCl₂) and HCl: When hydrochloric acid is added to calcium chloride, there will be no visible reaction. You might observe a slight warming due to the exothermic nature of the reaction, but no gas will be produced.

* Calcium carbonate (CaCO₃) and HCl: When hydrochloric acid is added to calcium carbonate, a vigorous reaction will occur. You will observe:

* Bubbling: Carbon dioxide gas (CO₂) will be released, causing fizzing.

* Possible warming: The reaction is exothermic, so you might feel some heat.

The key difference is the production of carbon dioxide gas (CO₂) when HCl reacts with calcium carbonate. This provides a clear visual distinction between the two compounds.