This question is repeated once again in same test...weak base is present in antacids...And antacids are used to dissolve acidity in stomach...hence correct answer is A.

Antacids contain weak base

Antacids are commonly used to relieve symptoms of acid reflux, heartburn, and indigestion. These symptoms occur when there is an excess of stomach acid. Antacids work by neutralizing the excess stomach acid, thereby providing relief from these symptoms. The active ingredients in antacids are typically weak bases.

What are weak bases?

Weak bases are substances that can accept or react with protons (H+) but do not completely dissociate in water. They have limited ability to neutralize acids compared to strong bases. Weak bases have a lower pH value compared to strong bases and are less likely to cause adverse effects.

How do antacids work?

When stomach acid flows back into the esophagus, it causes a burning sensation known as heartburn. Antacids help to neutralize excess stomach acid by reacting with the acid to form water and a salt. This reaction raises the pH of the stomach acid, reducing its acidity.

Examples of weak bases in antacids

1. Aluminum hydroxide: This is a common ingredient in antacids. It reacts with stomach acid to form aluminum chloride and water.

2. Magnesium hydroxide: Another commonly used ingredient, it reacts with stomach acid to form magnesium chloride and water.

3. Calcium carbonate: This compound is found in many antacids. It reacts with stomach acid to form calcium chloride, carbon dioxide, and water.

4. Sodium bicarbonate: Also known as baking soda, it is sometimes used in antacids. It reacts with stomach acid to form sodium chloride, carbon dioxide, and water.

Advantages of using weak bases in antacids

1. Neutralization of stomach acid: Weak bases effectively neutralize excess stomach acid, providing relief from symptoms.

2. Safety: Weak bases have a lower pH compared to strong bases, making them less likely to cause adverse effects or imbalances in the body.

3. Ease of administration: Antacids containing weak bases are available in various forms such as tablets, chewable tablets, and liquids, making them easy to consume.

4. Cost-effective: Antacids with weak bases are generally more affordable compared to prescription medications used to treat acid reflux and heartburn.

Overall, antacids contain weak bases, which work by neutralizing excess stomach acid, providing relief from acid reflux, heartburn, and indigestion. They are safe, effective, and widely available over-the-counter.