Investigating acids and alkali
1. What it is
Test if a substance is acid, alkali, or neutral.
Know if it’s strong or weak.
Test everyday items like lemon juice or soap.
Shows how they react.
2. How to test
Litmus paper: red → blue (alkali), blue → red (acid).
Universal indicator: shows pH colour.
pH meter: exact reading.
3. Why we do it
Identify acids/alkalis.
Know strong or weak.
Learn reactions safely.
Apply in daily life.
Fun Fact
Red cabbage is a natural indicator.
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