Question

characteristics of alum?
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Answer 1

Most alums have an astringent and acid taste. They are colourless, odourless, and exist as a white crystalline powder. Alums are generally soluble in hot water, and they can be readily precipitated from aqueous solutions to form large octahedral crystals.

Answer 2

QuestioN :

Characteristics of Alum ?

ANswer :

→An alum is a type of chemical compound, usually a hydrated double sulfate salt of aluminium with the general formula $XAI(SO_4)_2$ ·  $12H_2O$ ,  where X is a monovalent cation such as potassium or ammonium.

→By itself, "alum" often refers to potassium alum, with the formula $KAI(SO_4)_2$ ·  $12H_2O$.

→Other alums are named after the monovalent ion, such as sodium alum and ammonium alum.

→The name "alum" is also used, more generally, for salts with the same formula and structure, except that aluminium is replaced by another trivalent metal ion like chromium(III), and/or sulfur is replaced by another chalcogen like selenium.

→The most common of these analogs is chrome alum $KCr(SO_4)_2$ · $12H_2O$.

→Most alums have an astringent and acid taste.

→They are colourless, odourless, and exist as a white crystalline powder.

→Alums are generally soluble in hot water, and they can be readily precipitated from aqueous solutions to form large octahedral crystals.