上一片用 pH 标尺量出了酸碱度。这次 ⚗️ 小烧瓶要做一个大胆的实验：把酸和碱倒进同一个烧杯——它们会打架，还是会握手？Last leaf we measured acidity with the pH ruler. This time ⚗️ the little flask tries something bold: pour an acid and a base into one beaker — do they fight, or shake hands?
第 1 步：一握手，变成水Step 1: One handshake makes water
酸里多的是 H⁺，碱里多的是 OH⁻。它们碰面会发生什么？Acids are rich in H⁺, bases are rich in OH⁻. What happens when they meet?
小烧瓶一看就懂：酸 + 碱 → 盐 + 水。本质只有一笔账：H⁺ + OH⁻ → H₂O。H⁺ 和 OH⁻ 一牵手就变成水分子；原来酸里的 Cl⁻ 和碱里的 Na⁺ 留在水里，就是盐。中和还会放热——摸摸杯壁，是温的。The flask gets it at once: acid + base → salt + water. The heart of it is one line: H⁺ + OH⁻ → H₂O. H⁺ and OH⁻ join hands and become a water molecule; the Cl⁻ from the acid and Na⁺ from the base stay in the water — that is the salt. Neutralization also releases heat — touch the beaker wall: it feels warm.
这个"握手"离我们远吗？其实每天都在你身边发生。Is this handshake far from daily life? It happens around you every day.
第 2 步：生活里的中和Step 2: Neutralization in daily life
吃多了反酸，胃药里的碱去中和多余的胃酸（胃酸主要是 HCl）；被蚊子叮了涂点肥皂水——蚁酸遇上碱，痒感就轻了；土壤太酸，农民撒熟石灰（一种碱）把它调回中间。哪里酸碱过了头，哪里就有中和来"握手言和"。Heartburn after a big meal? The base in an antacid neutralizes extra stomach acid (mostly HCl). Mosquito bite? A little soap water helps — formic acid meets base and the itch eases. Soil too sour? Farmers spread slaked lime, a base, to bring it back to the middle. Wherever acid or base goes too far, neutralization shakes hands and settles it.
那要各倒多少，才能刚好中和？实验室用滴管一滴一滴来数。So how much of each, to neutralize exactly? The lab counts it drop by drop.
第 3 步：一滴之差：滴定实验Step 3: One drop makes the difference
把碱液一滴一滴加进酸里，pH 曲线先慢慢爬，到中和点附近突然"跳"起来——从 3 直接窜到 10 以上。这个陡跳点就是中和点，pH 正好 7，指示剂也在这里变色，提醒你"停！"。一滴之差，天壤之别，这就是滴定实验的厉害之处。Add base to acid drop by drop: the pH curve crawls up slowly, then suddenly leaps near the neutral point — from 3 straight past 10. That leap is the neutral point, where pH is exactly 7 and the indicator changes color to say “stop!”. One drop makes all the difference — that is the power of titration.
🎮 你来当滴定员（30 秒）🎮 Your turn: run a titration (30 seconds)
道理讲完了。点「滴一滴」往酸里加碱液，盯住 pH 数字和曲线；到 7 附近果断按「停止滴定」，4 杯都中和成功就算通关。Theory done. Tap “Drop one” to add base and watch the pH number and curve; when it is near 7, stop in time. Neutralize all 4 cups to win.
一句话记住它：酸 + 碱 → 盐 + 水；本质是 H⁺ + OH⁻ 手拉手，变成 H₂O。Remember it in one line: acid + base → salt + water; at heart, H⁺ and OH⁻ hold hands and become H₂O.
本质：H⁺ + OH⁻ → H₂O，剩下的离子组成盐（如 NaCl）Heart: H⁺ + OH⁻ → H₂O; the leftover ions form a salt (like NaCl)生活实例：胃药治胃酸、肥皂水止痒、熟石灰改良酸土Daily life: antacids for stomach acid, soap water for bites, lime for sour soil滴定：一滴一滴加碱，pH 在中和点附近陡跳到 7Titration: drip base in; pH leaps to 7 at the neutral point
内容参考 OpenStax 等公开教材，多来源核对 · AI 生成、人工审核 · 发现错误欢迎指正，帮这片叶子长得更好。Based on OpenStax and other open textbooks, cross-checked across sources · AI-generated, human-reviewed · Spotted a mistake? Tell us — help this leaf grow.
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