5.6 Indicators and the pH Scale

​pH Scale

Match

Could you match the following chemicals to their pH numbers?

• pH 1

• pH 5

• pH 7

• pH 9

• pH 12

Stomach acid

Honey

Water

Baking Soda

Soap Water

• Stomach acid

• Honey

• Water

• Baking Soda

• Soap Water

​

​

​Hydrochloric acid

Sodium hydroxide​

​Water

​Indicators

Multiple Choice

What is the main difference between litmus indicator and Universal indicator?

• Litmus indicator changes color based on temperature, while Universal indicator changes color based on pH level
• Litmus indicator is used for testing water purity, while Universal indicator is used for testing soil acidity
• Litmus indicator provides a numerical pH value, while Universal indicator provides a color change
• Litmus indicator changes color based on whether a substance is acidic or basic, while Universal indicator provides a full range of colors to indicate the pH level of a substance.

Multiple Choice

What would be the colour of Universal indicator for water?

• Blue
• Red
• Yellow
• Purple
• Green

Multiple Choice

What would be the colour of Universal indicator for urine?

• Blue
• Red
• Yellow
• Purple
• Green

Multiple Choice

What would be the colour of Universal indicator for soapy water?

• Blue
• Red
• Yellow
• Purple
• Green

Multiple Choice

What would be the colour of Universal indicator for drain cleaner?

• Blue
• Red
• Yellow
• Purple
• Green

Multiple Choice

What would be the colour of Litmus indicator for drain cleaner?

• Blue
• Red
• Yellow
• Purple
• Green

Multiple Choice

What would be the colour of Litmus indicator for urine?

• Blue
• Red
• Yellow
• Purple
• Green

Multiple Choice

What would be the colour of Litmus indicator for water?

• Blue
• Red
• Yellow
• Purple
• Green