Antacids are alkaline solutions of different hydroxides used to neutralize the acidity of the stomach, in conditions of hyperactivity, leading to excess HCl secretion. They provide relief in case of achalasia.
Example:Milk of magnesia,containing Mg(OH)2
Final Answer:
Hence, antacids can be defined as alkaline solutions like that of Mg(OH)2 which can neutralize gastric acidity.