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- Dictionarylitmus test
noun
- 1. a test for acidity or alkalinity using litmus.
- 2. a decisively indicative test: "effectiveness in these areas is often a good litmus test of overall quality"
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A litmus test is a test in which a single factor (such as an attitude, event, or fact) is decisive. Learn the origin, usage, and examples of this phrase from the Merriam-Webster dictionary.
A litmus test is a chemical test to see if a substance is acid or alkaline, or a test of someone's opinion or decision about something. Learn more about the origin, usage and synonyms of this term from Cambridge Dictionary.
A litmus test is a chemical test to see if a substance is acid or alkaline, or a decision or opinion that shows someone's views on a wider issue. Learn more about the meaning, usage and origin of this phrase with examples and translations.
- Litmus Paper Colors
- How to Perform The Litmus Test
- Limitations of The Litmus Test
- History and Preparation
- How The Litmus Test Works
- Alternatives to Litmus Paper
- References
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There are three varieties of litmus paper: purple, blue, and red. Purple litmus paper contains the dyes used in both blue and red litmus paper. 1. Purple Litmus Paper: Purple at neutral pH, red below pH 4.5, blue above pH 8.3 2. Blue Litmus Paper: Unchanged blue or sometimes purple at neutral pH, red below pH 4.5, blue above pH 8.3. Blue paper that...
The litmus test tells whether a liquid or gas is acidic, neutral, or basic. It indicates whether the substance is pH 4.5 or lower, between 4.5 and 8.3, or 8.3 or higher. The litmus test does not accurately gauge pH — it only tells if the sample is acidic, neutral, or basic.
The biggest limitation of the litmus test is that it gives a rough estimate of pH and not a numerical value. Another limitation is that litmus sometimes changes colors from reactions beside an acid-base reaction. For example, chlorine gas turns blue litmus paper irreversibly white. Basically, it bleaches the dye.
The word “litmus” comes from an old Norse word for “color” or “dye.” Litmus came into use around 1300 CE by Spanish alchemistry and physician Arnaldus de Villa Nova. Lichens have been a source of litmus from the 16th century into modern times. Currently, the main sources of litmus are the species Roccella montagnei and Dendrographa leucophoea. Othe...
Red litmus is a weak diprotic acid. When exposed to a base, hydrogen ions from litmus react with the base to form the blue conjugate base. The mechanism works in reverse for blue litmus. The blue conjugate base accepts protons from the acid in the test sample, producing the red litmus. At a neutral pH, the process is at equilibrium. Both the red di...
Coating filter paper with orcein dye or azolitmin dye results in filter paper that behaves much like litmus paper. However, you can coat filter paper with any pH indicator. Universal indicator yields a rainbow of color changes that correspond to numerical pH values. Red cabbage juiceis another good choice because it displays a range of colors and i...
Beecken, H.; E-M. Gottschalk; U. v Gizycki; H. Krämer; D. Maassen; H-G. Matthies; H. Musso; C. Rathjen; Ul. Zdhorszky (2003). “Orcein and Litmus”. Biotechnic & Histochemistry. 78 (6): 289–302. doi:...Musso, H.; Rathjen, C. (1959). “Orcein dyes. X. Light absorption and chromophore of litmus”. Chem. Ber. 92(3): 751–3. doi:10.1002/cber.19590920331Litmus test is a method to determine whether a liquid or gas is acidic, basic, or neutral using litmus paper. Litmus paper is a pH indicator made from lichens that changes color in response to acids or bases.
A litmus test is a criterion or standard that is used to judge the acceptability of someone or something. Learn how to use this term in different contexts and see synonyms and related words.
A litmus test is a way of proving or measuring something, or a test that depends on one factor. Learn the origin, usage and synonyms of this phrase from Collins English Dictionary.
A litmus test is used in chemistry to determine if a solution is acidic or basic using litmus or litmus paper. Litmus comes from certain species of lichens. Litmus will turn blue when exposed to a base and red when exposed to an acid. Litmus paper is paper with litmus in or on it.
