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The pH range is commonly given as zero to 14, but a pH value can be less than 0 for very concentrated strong acids or greater than 14 for very concentrated strong bases. [2] The pH scale is traceable to a set of standard solutions whose pH is established by international agreement. [3]
A universal indicator is a pH indicator made of a solution of several compounds that exhibit various smooth colour changes over a wide range pH values to indicate the acidity or alkalinity of solutions. A universal indicator can be in paper form or present in a form of a solution. [1]
Extracting anthocyanins from household plants, especially red cabbage, to form a crude pH indicator is a popular introductory chemistry demonstration. Litmus , used by alchemists in the Middle Ages and still readily available, is a naturally occurring pH indicator made from a mixture of lichen species, particularly Roccella tinctoria .
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. In short, it is a dye and indicator which is used to place substances on a pH scale.
2. Chef's Knife. A dull, unwieldy knife can make cooking a dangerous chore when it should be a pleasure. A well-made chef's knife should feel good in the hand and last forever with proper care.
The following other wikis use this file: Usage on bg.wikipedia.org Водороден показател; Usage on en.wikibooks.org Principles of Biochemistry/Water: The solvent of the cell
Check out the slideshow above to learn unusual uses for common household items. Related articles. AOL. The best Valentine’s Day chocolates, tested by AOL. AOL. The best Dutch ovens of 2025. AOL.
Keep items that are used often or have a specific sentimental value; everything else can be discarded, donated, or downsized. Related: Martha's 39 Best Kitchen Organizing Tips Will Help You Make ...
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