酸とアルカリの中和って、実は君たちの日常生活にめちゃくちゃ関わってるんだ。胃薬を飲んだり、洗剤を使ったりするのも、実は中和の原理を使ってるんだよ。
理科22 views·Updated Jun 4, 2026·1 page酸とアルカリ: 性質と中和反応の仕組み
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酸とアルカリ、中和の基本
君の胃が痛い時に飲む胃薬、実は中和反応を利用してるって知ってた？胃酸（酸性）を薬（アルカリ性）で中和して痛みを和らげてるんだ。
酸性の物質は水素イオン（H⁺）を放出して、アルカリ性の物質は水酸化物イオン（OH⁻）を放出する。この2つが出会うと、お互いの性質を打ち消し合って水と塩を作るんだ。
pHは0から14までの数字で、7が中性、7未満が酸性、7より大きいとアルカリ性を示す。レモン汁はpH2くらいで酸性、石鹸水はpH9くらいでアルカリ性だよ。
指示薬を使えば、溶液が酸性かアルカリ性かすぐ分かる。リトマス試験紙なら酸性で赤、アルカリ性で青に変わるから覚えやすいよね。
ポイント！ 中和反応では必ず熱が発生するから、実験中は注意しよう！
電離度が高い物質ほど強い酸やアルカリになる。塩酸は電離度が高いから強酸、酢酸は電離度が低いから弱酸なんだ。
中和が完全に起こるのは、酸が出すH⁺の量とアルカリが出すOH⁻の量が同じ時。この量的関係を理解すれば、中和滴定の計算も楽勝だよ。
テストでよく出るのは、指示薬の色変化と中和反応の量的関係。フェノールフタレインはアルカリ性で赤色、メチルオレンジは酸性で赤色になるから、混同しないよう注意しよう！
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理科22 views·Updated Jun 4, 2026·1 page酸とアルカリ: 性質と中和反応の仕組み
酸とアルカリの中和って、実は君たちの日常生活にめちゃくちゃ関わってるんだ。胃薬を飲んだり、洗剤を使ったりするのも、実は中和の原理を使ってるんだよ。
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酸とアルカリ、中和の基本
君の胃が痛い時に飲む胃薬、実は中和反応を利用してるって知ってた？胃酸（酸性）を薬（アルカリ性）で中和して痛みを和らげてるんだ。
酸性の物質は水素イオン（H⁺）を放出して、アルカリ性の物質は水酸化物イオン（OH⁻）を放出する。この2つが出会うと、お互いの性質を打ち消し合って水と塩を作るんだ。
pHは0から14までの数字で、7が中性、7未満が酸性、7より大きいとアルカリ性を示す。レモン汁はpH2くらいで酸性、石鹸水はpH9くらいでアルカリ性だよ。
指示薬を使えば、溶液が酸性かアルカリ性かすぐ分かる。リトマス試験紙なら酸性で赤、アルカリ性で青に変わるから覚えやすいよね。
ポイント！ 中和反応では必ず熱が発生するから、実験中は注意しよう！
電離度が高い物質ほど強い酸やアルカリになる。塩酸は電離度が高いから強酸、酢酸は電離度が低いから弱酸なんだ。
中和が完全に起こるのは、酸が出すH⁺の量とアルカリが出すOH⁻の量が同じ時。この量的関係を理解すれば、中和滴定の計算も楽勝だよ。
テストでよく出るのは、指示薬の色変化と中和反応の量的関係。フェノールフタレインはアルカリ性で赤色、メチルオレンジは酸性で赤色になるから、混同しないよう注意しよう！
We thought you’d never ask...
What is the Knowunity AI companion?
Our AI Companion is a student-focused AI tool that offers more than just answers. Built on millions of Knowunity resources, it provides relevant information, personalised study plans, quizzes, and content directly in the chat, adapting to your individual learning journey.
Where can I download the Knowunity app?
You can download the app from Google Play Store and Apple App Store.
Is Knowunity really free of charge?
That's right! Enjoy free access to study content, connect with fellow students, and get instant help – all at your fingertips.
Most popular content in 理科
9Most popular content
9Can't find what you're looking for? Explore other subjects.
Students love us — and so will you.
4.6/5App Store
4.7/5Google Play
The app is very easy to use and well designed. I have found everything I was looking for so far and have been able to learn a lot from the presentations! I will definitely use the app for a class assignment! And of course it also helps a lot as an inspiration.
Stefan SiOS user
This app is really great. There are so many study notes and help [...]. My problem subject is French, for example, and the app has so many options for help. Thanks to this app, I have improved my French. I would recommend it to anyone.
Samantha KlichAndroid user
Wow, I am really amazed. I just tried the app because I've seen it advertised many times and was absolutely stunned. This app is THE HELP you want for school and above all, it offers so many things, such as workouts and fact sheets, which have been VERY helpful to me personally.
AnnaiOS user