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  2. Litmus - Wikipedia

    en.wikipedia.org/wiki/Litmus

    Litmus paper after being used. The main use of litmus is to test whether a solution is acidic or basic, as blue litmus paper turns red under acidic conditions, and red litmus paper turns blue under basic or alkaline conditions, with the color change occurring over the pH range 4.5–8.3 at 25 °C (77 °F). Neutral litmus paper is purple. [2]

  3. Flame test - Wikipedia

    en.wikipedia.org/wiki/Flame_test

    A flame test involves introducing a sample of the element or compound to a hot, non-luminous flame and observing the color of the flame that results. [4] The compound can be made into a paste with concentrated hydrochloric acid, as metal halides , being volatile, give better results. [ 5 ]

  4. Universal indicator - Wikipedia

    en.wikipedia.org/wiki/Universal_indicator

    Paper form: It is a strip of coloured paper which changes colour to red if the solution is acidic and to blue, if the solution is basic. The strip can be placed directly onto a surface of a wet substance or a few drops of the solution can be dropped onto the universal indicator using dropping equipment.

  5. Litmus test - Wikipedia

    en.wikipedia.org/wiki/Litmus_test

    Litmus test may refer to: Litmus test (chemistry), used to determine the acidity of a chemical solution; Litmus test (politics), a question that seeks to find the character of a potential candidate by measuring a single indicator; The Litmus Test, a Radio 4 programme presented by Fred Harris; The Litmus Test, a 2004 album by Cut Chemist

  6. Paper chromatography - Wikipedia

    en.wikipedia.org/wiki/Paper_chromatography

    Paper chromatography is an analytical method used to separate coloured chemicals or substances. [1] It is now primarily used as a teaching tool, having been replaced in the laboratory by other chromatography methods such as thin-layer chromatography (TLC).

  7. 5 pivotal 2025 contests that could also be Trump litmus tests

    www.aol.com/news/5-pivotal-2025-contests-could...

    Here are the key races to watch next year: New Jersey governor. New Jersey has been seen as a heavily Democratic state, won by President Biden by 16 points in 2020.

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