Acid-Base Indicators and pH Changes

This video tutorial, led by Dr. English, explores acid-base indicators, focusing on their role in determining pH levels by changing color. The tutorial explains how to use Table M from a reference table to identify various indicators and their color changes across different pH ranges. Through examples, the video demonstrates how to apply this knowledge to determine the pH of unknown solutions. The tutorial concludes with practical questions and a summary of the key concepts covered.

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

• To alter the chemical composition of a solution

• To change the temperature of a solution

• To change color based on the pH of a solution

• To increase the acidity of a solution

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

• Litmus Paper

• Methyl Orange

• Phenolphthalein

• Bromothymol Blue

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

• 3.1 to 4.4

• 6.0 to 7.6

• 8.0 to 9.6

• 4.5 to 8.3

What color does litmus paper turn in a basic solution?

• Red

• Yellow

• Blue

• Green

Which indicator is not commonly seen on exams but has a range of 3.8 to 5.4?

• Bromocresol Green

• Methyl Orange

• Thymol Blue

• Phenolphthalein

Which indicator changes from yellow to blue as the pH shifts from 5.5 to 8?

• Bromothymol Blue

• Methyl Orange

• Litmus Paper

• Phenolphthalein

What is the color of phenolphthalein in a solution with a pH of 10?

• Colorless

• Yellow

• Light Pink

• Bright Pink

If a solution turns from bright pink to clear when another solution is added, what is the likely pH of the added solution?

• Highly acidic

• Neutral

• Acidic or potentially neutral

• Strongly basic

What pH range does phenolphthalein turn from colorless to pink?

• 9.1 to 14

• 0 to 3

• 4.4 to 7

• 8 to 9

What did the tutorial primarily focus on?

• The industrial applications of bases

• The history of pH measurement

• The use of Table M for acid-base indicators

• The chemical composition of acids