Chemistry (Ph Antaicds)

Chemistry (Ph Antaicds) - Year 12 Chemistry: Semester 3,...

Info iconThis preview shows pages 1–2. Sign up to view the full content.

View Full Document Right Arrow Icon
Year 12 Chemistry: Semester 3, 2009-05-25 pH Change for Antacids Introduction: The main components of the digestive fluid in the human stomach are pepsinogen (an inactive form of the enzyme pepsin) and hydrochloric acid (HCl). The HCl promotes the conversion of pepsinogen into its active form (pepsin) and provides the necessary pH for the enzyme pepsin can break down protein molecules (which is food basically). When excessive digestive fluid (gastric juice, which is this combination of HCl and pepsinogen and some other substances) is secreted, it may contribute to the formation of an ulcer in the stomach lining. One of the most common remedies for excessive digestive fluid (otherwise known as stomach acidity) is antacid tablets. These tablets neutralise excess acid in the digestive fluid. The acid base neutralisation between the antacid and the HCl in the digestive fluid is as follows. Antacid (weak base) + HCl (stomach acid) → H 2 O +CO 2 + salts Antacids contain buffer systems to moderate the change in pH. They also contain other ingredients such as flavouring agents and substances that make the tablet stick together. Background Information: The digestive fluids in our stomachs are made up of several chemicals and solutions. The most important being the Hydrochloric acid and the pepsinogen, which are among the key ingredients that help us digest the food we, eat. Here's how the stomach works. The HCl acid in your stomach likes to be at strength of between a pH of 1 to 3. A hormone called "Gastrin" maintains this acid strength. When your stomach acid becomes weak, a pH above 3, "G cells" in the lining of your stomach release Gastrin, This Gastrin hormone activates "parietal cells, also located in the stomach lining, to release HCl acid. As more acid is pumped into the stomach, the pH drops down below 3 which signal the G
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Image of page 2
This is the end of the preview. Sign up to access the rest of the document.

Page1 / 3

Chemistry (Ph Antaicds) - Year 12 Chemistry: Semester 3,...

This preview shows document pages 1 - 2. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online