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Lesson 4
Acids and bases: the pH scale
📖 Lesson
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🎯 Quiz — pick the translation
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✅ Lesson done
A lemon is sour — an acid, soap is slippery — a base. Scientists measure with the pH scale: 0–6 acid, 7 neutral, 8–14 base.
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Acid (lemon)
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Base (soap)
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Neutral (water)
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Vinegar
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Baking soda
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Ammonia
💡 Acid + base = salt + water. That is how baking soda fights heartburn!
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Test yourself!
Quiz — pick the translation →
🖨 Worksheet
Practice the topic with the trainer — like after class