Class 7ScienceAcids, Bases and Salts
pH Scale and Indicators
pH measures acidity/alkalinity: 0-14 scale. pH < 7: acid. pH = 7: neutral (pure water). pH > 7: base/alkali. Litmus: natural indicator from lichens. Turns RED in acid, BLUE in base. Turmeric: yellow in acid/neutral, RED-BROWN in base. Phenolphthalein: colorless in acid, pink in base. Methylorange: red in acid, yellow in base.
10 examples
Concept check 1
For Class 7 Science, explain or solve a ph scale and indicators question from the chapter "Acids, Bases and Salts". Focus on concept check and show the working clearly.
Definition to application 2
For Class 7 Science, explain or solve a ph scale and indicators question from the chapter "Acids, Bases and Salts". Focus on definition to application and show the working clearly.
Formula warm-up 3
For Class 7 Science, explain or solve a ph scale and indicators question from the chapter "Acids, Bases and Salts". Focus on formula warm-up and show the working clearly.
Reasoning practice 4
For Class 7 Science, explain or solve a ph scale and indicators question from the chapter "Acids, Bases and Salts". Focus on reasoning practice and show the working clearly.
Board-style short answer 5
For Class 7 Science, explain or solve a ph scale and indicators question from the chapter "Acids, Bases and Salts". Focus on board-style short answer and show the working clearly.
Mistake correction 6
For Class 7 Science, explain or solve a ph scale and indicators question from the chapter "Acids, Bases and Salts". Focus on mistake correction and show the working clearly.
Visual interpretation 7
For Class 7 Science, explain or solve a ph scale and indicators question from the chapter "Acids, Bases and Salts". Focus on visual interpretation and show the working clearly.
Applied word problem 8
For Class 7 Science, explain or solve a ph scale and indicators question from the chapter "Acids, Bases and Salts". Focus on applied word problem and show the working clearly.
Revision challenge 9
For Class 7 Science, explain or solve a ph scale and indicators question from the chapter "Acids, Bases and Salts". Focus on revision challenge and show the working clearly.
Exam recap 10
For Class 7 Science, explain or solve a ph scale and indicators question from the chapter "Acids, Bases and Salts". Focus on exam recap and show the working clearly.