The pH Scale
Class 10 Science: acids, bases and salts (pH)
Add universal indicator to everyday liquids and find their pH. Which are acids, which are bases?
Words to know
- pH
- A number from 0 to 14 that shows how acidic or basic a solution is.
- Acid
- pH below 7; tastes sour, like lemon juice.
- Base
- pH above 7; feels soapy, like soap solution.
- Neutral
- pH 7, neither acid nor base, like pure water.
Quick check
Answer 3 questions to check what you learned.
Try at home
Make red cabbage indicator with an adult (boil a few leaves, cool the purple water). Test lemon juice, vinegar, baking soda water and soap water. Arrange them from most acidic to most basic.