Seeing red? If it was blue litmus paper, then it is an acid. Viewers learn about the pH scale through a video that shows how liquids may be tested by litmus paper and a universal indicator. 

Concepts

ph, acids and bases, litmus paper, alkalies

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Additional Tags

science

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Instructional Ideas

• Test liquids using litmus paper
• Use a universal indicator to determine the pH of various liquids

Classroom Considerations

• Requires no prior knowledge, making this an appropriate introduction to the topic
• Video is the first in a 21-part series

Pros

• Provides closed captioning in both English and Hindi
• Graphics are clear and colors contrast nicely

Cons

• None

Common Core

RST.9-10.4 RST.11-12.4