If the metal hydroxides are insoluble then how do they work as antacids ?? How are they able to neutralise the acidic environment of the stomach ??

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Solution

The metal hydroxides are present in salts and they react with HCl present in the stomach to produce salt, water and a gas.
The salts that are produced after the reaction are soluble in water.
CaCO₃ + HCl → CaCl₂ + CO₂+ H₂O
Calcium carbonate is a common component of antacids and is insoluble but calcium chloride is soluble.

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