The main use of litmus is to test whether a solution is acidic or basic. Light-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).
Litmus turns red in acidic solutions and blue in alkaline solutions and is the oldest and most commonly used indicator of whether a substance is an acid or a base. Treatment of the lichens with ammonia, potash, and lime in the presence of air produces the various coloured components of litmus.
If you say that something is a litmus test of something, you mean that it is an effective and definite way of proving it or measuring it. Ending the fighting must be the absolute priority, the litmus test of the agreement's validity. The success of wind power represents a litmus test for renewable energy. 'litmus test'
Lippman's Test: Client is seated. Practitioner palpates the bicipital tendon in the bicipital tendon groove and flexes the elbow flexed to 90°, passively moving the bicep. Purpose: Assess for bicipital instability.
An indicator is a substance that changes colour when it is added to acidic or alkaline solutions. Litmus and universal indicator are two indicators that are commonly used in the laboratory.
fire, gauntlet. (also gantlet), ordeal, trial.
COMMON If something is a litmus test of the quality or success of a particular thing, it is an effective way of proving it or measuring it. My personal litmus test when I have to decide whether to keep or discard something is whether or not I look at and enjoy it every day.
pH may look like it belongs on the periodic table of elements, but it's actually a unit of measurement. The abbreviation pH stands for potential hydrogen, and it tells us how much hydrogen is in liquids—and how active the hydrogen ion is.
Litmus is extracted from lichens. It has a mauve (purple) colour in distilled water. When added to an acidic solution, it turns red and when added to a basic solution, it turns blue. So, it is used to test the acidic or basic nature of solutions.
Made from lichen, litmus can be absorbed onto paper which turns blue to indicate an alkaline substance and red if it's acidic. Litmus comes from the Middle Dutch word lijkmoes, which combines lac, "red resinous substance" and moes, "pulp."
Litmus test. An examination of the political ideology of a nominated judge. Federal question cases. Cases concerning the Constitution, federal laws, or treaties.
noun. a blue coloring matter obtained from certain lichens, especially Roccella tinctoria. In alkaline solution litmus turns blue, in acid solution, red: widely used as a chemical indicator.
Litmus is a colouring matter obtained from lichens that turns red in acid solutions and blue in basic/ alkaline solutions. It is a water-soluble mixture of different dyes. It is a weak organic compound and is used as a universal pH indicator in the form of litmus papers.
