pH Levels and Milk Acidity

The video explores the pH level of milk, questioning whether it is acidic, basic, or neutral. Initially, pH paper is used, indicating milk's pH is between 6 and 7, suggesting slight acidity. This is confirmed with a pH meter, which provides a more precise reading of 6.59. The video explains that milk is slightly acidic and becomes more so as it sours due to lactic acid formation.

What is the main question being explored about milk in the video?

• Whether milk is a good source of calcium

• Whether milk is nutritious

• Whether milk is an acid, base, or neutral

• Whether milk is a solid or liquid

What does the pH paper indicate about the acidity of milk?

• Milk is basic

• Milk is neutral

• Milk is highly acidic

• Milk is slightly acidic

What color does the pH paper turn when dipped in milk?

• Yellow

• Red

• Blue

• Green

What is the approximate pH range of milk according to the pH paper?

• Between 5 and 6

• Between 6 and 7

• Between 8 and 9

• Between 7 and 8

How does the pH meter reading compare to the pH paper reading?

• The pH meter shows milk is basic

• The pH meter confirms the paper's reading of slight acidity

• The pH meter shows milk is more acidic than the paper indicated

• The pH meter shows milk is neutral

What is the exact pH reading of milk using the pH meter?

• 6.00

• 7.59

• 6.59

• 7.00

Why does milk become more acidic over time?

• It absorbs carbon dioxide

• It produces more lactic acid

• It gains more sugar

• It loses water content

What is the significance of milk's pH being below 7?

• It indicates milk is acidic

• It indicates milk is alkaline

• It indicates milk is neutral

• It indicates milk is basic