CBSE Class 7 Science Notes Chapter 5: "Acids, Bases, and Salts" is one of the most significant chapters in the science syllabus for Class 7. This chapter covers the definitions of acids, bases, and salts as well as their formation in the syllabus. At this point, the students will require the help of the Class 7 Science Chapter 5 notes, which have been developed by our top Chemistry specialists.
These notes will assist them in correctly assimilating the new ideas and applying them to the practice and subsequent test questions. You can use these notes as a resource to review the chapter before an exam, and you can access them from anywhere at any time.CBSE Class 7 Science Notes Chapter 5 PDF
In Nature, Three Types of Substances are Found:
a. Acids
b. Bases
c. Salts
1. Natural Indicators:
Litmus: Lichens are the source of it. Most commonly, it comes in the form of a solution or thin paper strips. The hue of blue litmus turns red when acid is applied. Red litmus paper becomes blue when bases are added to it. b. Turmeric: This natural indicator stays yellow in acidic and neutral solutions, but turns red when it comes into touch with alkaline ones. c. China Rose: Another naturally occurring indicator that changes basic solutions to green and acidic solutions to dark pink (magenta). d. Red Cabbage: This plant changes basic solutions to blue and acidic solutions to red.Some Other Indicators:
a. Methyl Orange: It produces a pinkish-red colour in acidic solutions and a yellow colour in bases. b. Phenolphthalein: It serves as a gauge for acidity and base. In alkaline liquids, it turns pink, but in acidic solutions, it stays colourless.