Litmus - Wikipedia
网页Litmus is a water-soluble mixture of different dyes extracted from lichens. It is often absorbed onto filter paper to produce one of the oldest forms of pH indicator, used to test materials for acidity. In an acidic medium, blue litmus paper turns red, while in a basic or alkaline medium, red litmus paper turns blue.
LITMUS中文(简体)翻译：剑桥词典 - Cambridge Dictionary
网页litmus. noun [ U ] uk / ˈlɪt.məs / us / ˈlɪt.məs /. Add to word list. a powder that is turned red by acid and blue by alkali. 石蕊. litmus paper 石蕊试纸. a litmus test 石蕊测试. 也请参见.
Litmus Paper and the Litmus Test - ThoughtCo
网页2024年7月24日 · Litmus paper is a type of pH paper made by treating the paper with natural dyes from lichens. The litmus test is performed by placing a small drop of sample onto the colored paper. Usually, litmus paper is either red or blue. Red paper turns blue when the pH is basic (alkaline), while blue paper turns red when the pH is acidic.
Litmus Paper and the Litmus Test - Science Notes and Projects
网页2021年1月20日 · This litmus test uses red, blue, or purple litmus paper to determine whether a sample is acidic, basic, or neutral. Litmus paper is pH indicator made by treating filter paper with a solution of litmus. Litmus, in turn, is mixture of dyes made from lichens that changes color in response to acids (red) or bases (blue).
6. Acid-Base Indicators - Chemistry LibreTexts
网页2023年1月30日 · Acid-Base Indicators is shared under a CC BY-NC 4.0 license and was authored, remixed, and/or curated by Jim Clark. This page describes how simple acid-base indicators work, and how to choose the right one for a particular titration.
3 Ways to Do a Litmus Test - wikiHow
网页2023年12月22日 · Performing a litmus test is one of the oldest and simplest methods of determining the acidity or alkalinity of a solution. Litmus paper is made when a piece of thin paper is coated by organic dyes that are sensitive to changes in pH. When...
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Litmus test Definition & Meaning - Merriam-Webster
网页The meaning of LITMUS TEST is a test in which a single factor (such as an attitude, event, or fact) is decisive. How to use litmus test in a sentence. Litmus Test Has Scientific Origins.
Litmus | Acid-Base Reactions, pH Testing & Indicators
网页Litmus, mixture of coloured organic compounds obtained from several species of lichens that grow in the Netherlands, particularly Lecanora tartarea and Roccella tinctorum. Litmus turns red in acidic solutions and blue in alkaline solutions and is the oldest and most commonly used indicator of.
Litmus Definition & Meaning - Merriam-Webster
网页1. : a coloring matter from lichens that turns red in acid solutions and blue in alkaline solutions and is used as an acid-base indicator. 2. : the critical factor in a litmus test. also : litmus test.
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