Buffer Solutions and Reaction Indicators

This video tutorial demonstrates the effect of pH on the action of saliva amylase. It involves preparing three test tubes with different pH buffer solutions, adding saliva, and incubating them at 37°C. Iodine is used as an indicator to observe the color change, which is recorded at regular intervals to study the enzymatic activity under varying pH conditions.

What is the purpose of adding a pH 6.8 buffer solution to test tube A?

• To neutralize the solution

• To maintain a specific pH level

• To increase the reaction speed

• To change the color of the solution

Which buffer solution is added to test tube B?

• pH 6.8 buffer solution

• pH 4 buffer solution

• pH 9 buffer solution

• pH 7 buffer solution

What is the role of NaCl in the test tubes?

• To act as a catalyst

• To provide ions for the reaction

• To act as an indicator

• To change the pH

At what temperature are the test tubes incubated?

• 50 degrees Celsius

• 37 degrees Celsius

• 25 degrees Celsius

• 100 degrees Celsius

Why is saliva added to each test tube?

• To act as a buffer

• To initiate the reaction

• To change the color

• To increase the temperature

What is the purpose of using iodine solution in the experiment?

• To maintain temperature

• To indicate the presence of starch

• To neutralize the solution

• To act as a buffer

How often are the color changes recorded during the experiment?

• Every minute

• Every two minutes

• Every five minutes

• Every ten minutes

What does a color change in the iodine solution indicate?

• The absence of saliva

• The presence of NaCl

• The completion of the reaction

• The presence of starch