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课程 4
Acids and bases: the pH scale
📖 课程
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🎯 测验——选择翻译
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✅ 本课已完成
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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酸（柠檬）
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碱（肥皂）
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中性（水）
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醋
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小苏打
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氨
💡 Acid + base = salt + water. That is how baking soda fights heartburn!