Acid-Base Indicators and Their Functions

Dr. English introduces acid-base indicators, explaining their role in determining the pH of solutions by changing color. The tutorial covers how to use Table M from the reference table to identify pH ranges and color changes for various indicators. Examples include methyl orange, bromal blue, and litmus paper, highlighting their specific pH ranges and color transitions. Practical applications are discussed, demonstrating how to use multiple indicators to pinpoint unknown pH levels. The session concludes with a review of the key concepts and encourages further contact for additional help.

What is the primary function of an acid-base indicator?

• To alter the chemical composition of a solution

• To increase the acidity of a solution

• To change color based on the pH of a solution

• To change the temperature of a solution

Which indicator has a pH range of 3.1 to 4.4 and changes from red to yellow?

• Litmus paper

• Phenolphthalein

• Methyl orange

• Bromothymol blue

At what pH range does bromothymol blue transition from yellow to blue?

• 4.5 to 8.3

• 8.0 to 9.0

• 6.0 to 7.6

• 3.1 to 4.4

Which indicator is commonly used and has a range of 4.5 to 8.3?

• Methyl orange

• Bromocresol green

• Litmus paper

• Phenolphthalein

What color does litmus paper turn in a basic solution?

• Red

• Yellow

• Blue

• Green

Which indicator would be suitable for detecting a pH change from 5 to 8?

• Litmus paper

• Methyl orange

• Bromothymol blue

• Phenolphthalein

If a solution turns bright pink with phenolphthalein, what is its likely pH?

• Above 9

• Between 8 and 9

• Between 7 and 8

• Below 7

What happens to a basic solution when an acidic solution is added, according to the phenolphthalein indicator?

• It turns red

• It turns clear

• It remains pink

• It turns blue

What is the significance of the color change in acid-base indicators?

• It indicates a change in temperature

• It shows a change in pH level

• It suggests a change in pressure

• It reflects a change in volume

What did the tutorial primarily focus on?

• The physical properties of bases

• The history of chemistry

• The use of Table M and acid-base indicators

• The chemical composition of acids