Acids, bases and neutral · अम्ल, क्षारक और उदासीन
Lemon, soap or salt water? Sort them, then test your indicators.
Acids, bases and neutral games
Acid, base or neutral?
| Acid अम्ल | Base क्षारक | Neutral उदासीन | |
|---|---|---|---|
| Taste / feel | Sour | Bitter, soapy to touch | — |
| Blue litmus | turns red | stays blue | no change |
| Red litmus | stays red | turns blue | no change |
| Turmeric | stays yellow | turns red | stays yellow |
| China rose | dark pink (magenta) | green | no change |
| Phenolphthalein | colourless | pink | colourless |
| Examples | Lemon (citric), vinegar (acetic), curd (lactic), ant sting (formic) | Soap, baking soda, lime water, milk of magnesia | Salt water, sugar water, pure water |
Neutralisation: acid + base → salt + water (+ heat).
Goes with NCERT Curiosity Class 7, Ch 2 “Exploring Substances: Acidic, Basic, and Neutral”. Never taste or touch lab chemicals.
A one-page chart to stick on the wall, and a worksheet to practise.
Acids and bases
- Acid: sour; blue litmus → red; China rose → magenta. Lemon, vinegar, curd.
- Base: soapy; red litmus → blue; turmeric → red; China rose → green; phenolphthalein → pink. Soap, baking soda, lime water.
- Neutral: no change. Salt water, sugar water.
- Acid + base → salt + water + heat (neutralisation).
kheloaurseekho.in — free charts, games and worksheets
Acids and bases — worksheet
Name: ____________________ Class: ______ Date: __________
1. Write A (acid), B (base) or N (neutral): lemon juice ___ soap water ___ sugar water ___ vinegar ___
2. Blue litmus turns ______ in an acid. Turmeric turns ______ in a base.
3. What is neutralisation? ______________________
4. Why do we rub baking soda on an ant bite? ______________________
kheloaurseekho.in — free charts, games and worksheets
