Blueberry Juice pH Indicator Experiment

The video demonstrates how blueberry juice can be used as a pH indicator. When acid is added, the juice turns red, and when a base is added, it turns green. The process of preparing the juice involves skinning and grinding blueberries. The video also suggests using household items like vinegar and ammonia as alternatives. Other berries and colorful flowers can also serve as indicators.

What color does blueberry juice turn when mixed with an acid?

• Blue

• Pinkish red

• Green

• Yellow

What is the initial color of the blueberry juice solution before any acid or base is added?

• Purple

• Green

• Red

• Yellow

What happens to the color of blueberry juice when a base is added?

• It turns blue

• It turns yellow

• It turns green

• It remains purple

What is the purpose of using blueberry juice in this experiment?

• To make a drink

• To measure temperature

• To indicate if a solution is acidic or basic

• To test for sugar content

What is the effect of adding equal amounts of acid and base to the blueberry juice?

• It returns to its original color

• It remains unchanged

• It turns blue

• It turns yellow

What is a necessary step in preparing blueberry juice for this experiment?

• Drying the blueberries

• Boiling the blueberries

• Skinning the blueberries

• Freezing the blueberries

Why is it necessary to skin the blueberries for this experiment?

• The skin is toxic

• The skin contains too much water

• The skin is too hard

• The juice inside is not blue

Which household items can be used as alternatives to hydrochloric acid and sodium hydroxide?

• Vinegar and ammonia

• Milk and honey

• Salt and sugar

• Lemon juice and baking soda

Besides blueberries, what other natural items can be used as indicators?

• Only colorful flowers

• Only other berries

• Only fruits

• Many berries, flowers, and fruits