Learn how to classify substances as acidic, basic, or neutral, and how indicators help identify them.
Acidic substances taste sour (like lemon juice) and basic substances often feel soapy or slippery (like baking soda solution). Neutral substances are neither acidic nor basic.
Is lemon juice acidic, basic, or neutral?
Acidic
Is pure water acidic, basic, or neutral?
Neutral
Indicators are substances that change colour depending on whether they're mixed with an acid or a base, helping us identify unknown substances.
What colour does litmus paper turn in an acidic substance?
Blue litmus paper turns red in an acidic substance
What colour does litmus paper turn in a basic substance?
Red litmus paper turns blue in a basic substance
1. Is vinegar acidic, basic, or neutral?
2. Is soap solution acidic, basic, or neutral?
3. What is an indicator used for?
4. What colour is litmus paper in a neutral substance?
5. Name one natural indicator.