* Reaction: When an acid is added to a carbonate, a chemical reaction occurs, producing carbon dioxide gas (CO₂), water (H₂O), and a salt. For example:
* Acid + Carbonate → Salt + Carbon Dioxide + Water
* HCl (acid) + Na₂CO₃ (carbonate) → 2NaCl (salt) + CO₂ (gas) + H₂O (water)
* Milky Appearance: The milky appearance you might be thinking of is often associated with the formation of calcium carbonate (CaCO₃) in a solution. This is because calcium carbonate is insoluble in water and forms a cloudy suspension.
* Universal Indicator: Universal indicator is a pH indicator solution. It changes color depending on the pH of the solution. When acid is added to a carbonate, the solution becomes acidic, causing the universal indicator to change color (usually to red or orange).
In summary: The reaction of an acid with a carbonate produces carbon dioxide gas, not a milky suspension. The universal indicator will change color due to the acidic nature of the solution, not due to the formation of a precipitate.
