Stomach Acid and Antacid

The video tutorial demonstrates an experiment simulating stomach conditions to observe food breakdown and the effect of antacids. Using boiled egg white, pepsin, hydrochloric acid, and antacid tablets, the experiment shows how gastric acid aids protein digestion and how antacids can neutralize acidity, affecting enzyme activity. The procedure involves dissolving pepsin in acid, adding it to egg white, and comparing it with a mixture containing antacid. Observations reveal that the egg white without antacid dissolves, while the one with antacid remains, illustrating the role of acidity in digestion.

What is the purpose of using boiled egg white in the experiment?

• To observe color changes in acidic conditions

• To test the solubility of antacid

• To provide a protein source for pepsin to act on

• To simulate the texture of food in the stomach

Why is pepsin dissolved in hydrochloric acid during the experiment?

• To neutralize the acid

• To simulate the acidic environment of the stomach

• To increase the temperature of the solution

• To change the color of the solution

What is the role of the water bath in the experiment?

• To evaporate excess water

• To dissolve the antacid tablet

• To maintain the solutions at body temperature

• To cool down the solutions

How does the antacid affect the acidity of the solution?

• It makes the solution more acidic

• It increases the temperature of the solution

• It neutralizes the acid, making the solution less acidic

• It has no effect on the acidity

What observation is made about the egg white in the boiling tube without antacid after one hour?

• The egg white becomes solid

• The egg white remains unchanged

• The egg white has vanished

• The egg white turns blue

Why does the egg white in the second boiling tube remain visible?

• The egg white was not crushed properly

• The temperature was too high

• The antacid has neutralized the acid, slowing down pepsin activity

• The antacid has increased the acidity

What does the experiment demonstrate about the role of gastric acid?

• Gastric acid is only involved in carbohydrate digestion

• Gastric acid only affects the color of food

• Gastric acid helps create optimal conditions for pepsin to break down proteins

• Gastric acid is not necessary for digestion