Lesson 3 of 4 ยท Grade 7 Integrated Science
Acids, bases and indicators
15 min
Acids
Taste sour (never taste in the lab), turn blue litmus red, pH below 7.
Examples: lemon juice (citric acid), vinegar (acetic acid), sour milk (lactic acid), hydrochloric acid in the stomach.
Bases (alkalis are soluble bases)
Feel soapy, turn red litmus blue, pH above 7.
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