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The meaning of ALUM is a potassium aluminum sulfate KAl(SO4)2·12H2O or an ammonium aluminum sulfate NH4Al(SO4)2·12H2O used especially for its astringent and styptic properties. How to use alum in a sentence.

Crystal of potassium alum, KAl(SO 4) 2 ·12H 2 O. An alum (/ ˈ æ l ə m /) is a type of chemical compound, usually a hydrated double sulfate salt of aluminium with the general formula X Al(SO 4) 2 ·12 H 2 O, such that X is a monovalent cation such as potassium or ammonium. [1] By itself, "alum" often refers to potassium alum, with the ...

ALUM definition: 1. a chemical substance containing aluminium used in dyeing (= changing the colour of something…. Learn more.

May 5, 2024 · Alum refers to a collection of chemical compounds that are hydrated sulfate salts of aluminum and usually one other metal. Common forms of alum include hydrated potassium aluminum sulfate, ammonium aluminum sulfate, and sodium aluminum sulfate. The different compounds have different functions.

alum, any of a group of hydrated double salts, usually consisting of aluminum sulfate, water of hydration, and the sulfate of another element. A whole series of hydrated double salts results from the hydration of the sulfate of a singly charged cation (e.g., K +) and the sulfate of any one of a number of triply charged cations (e.g., Al 3+).

Any of various crystalline double salts of a trivalent metal (such as aluminum, chromium, or iron) and a monovalent metal (such as potassium or sodium), especially aluminum potassium …

a double sulfate of a monovalent metal or radical (as sodium, potassium, or ammonium) with a trivalent metal (as aluminum, iron, or chromium): it is used as an astringent, as an emetic, and in the manufacture of baking powders, dyes, and paper: the commonest form is potash alum (potassium aluminum sulfate), KAl(SO 4) 2 ·12H 2 O

Definition of alum noun from the Oxford Advanced Learner's Dictionary. a substance formed from aluminium and another metal, used, for example, to prepare leather and to change the colour of things. The Oxford Learner’s Thesaurus explains the difference between groups of similar words.

What does the noun alum mean? There are two meanings listed in OED's entry for the noun alum. See ‘Meaning & use’ for definitions, usage, and quotation evidence. alum has developed meanings and uses in subjects including. How common is the noun alum? How is the noun alum pronounced? Where does the noun alum come from?

Any of various crystalline salts in which a metal such as aluminum or chromium is combined with another metal such as potassium or sodium, especially aluminum potassium sulfate. Alum is widely used in industry as a hardener and purifier, and in …