not what it is used for. I don't need to know what it's molecular formula is. I just need to know what it is.
2006-12-21 14:30:43 · 5 answers · asked by nc123135 1 in Science & Mathematics ➔ Chemistry
True (potash) alum is chemically a double salt of aluminum, or potassium aluminum sulfate (K 2 SO 4 . Al 2 (SO 4 ) 3 . 24H 2 O).
Typically used in the 21st century in baking powder and also in pickles.
Most companies have been changing their formulas to not include alum in their products.
2006-12-22 17:03:37 · answer #1 · answered by tas 4 · 0⤊ 0⤋
Alum, Allom [aluminium potassium sulfate], in chemistry, is a term given to the crystallized double sulfates of the typical formula M+2SO4·M3+2(SO4)3·24H2O, where M+ is the sign of an alkali metal (lithium, sodium, potassium, rubidium, or caesium), and M3+ denotes one of the trivalent metal ions (typically aluminium, chromium, or iron (III)). The ammonium ion (NH4+) also occurs in the M+ position.
2006-12-21 14:39:10 · answer #2 · answered by eric l 6 · 0⤊ 0⤋
Alum, any of a group of chemical compounds, made up of water molecules and two kinds of salts, one of which is usually aluminum sulfate (Al2(SO 4)3), combined in definite proportions.
2006-12-21 14:39:52 · answer #3 · answered by Anonymous · 1⤊ 0⤋
alum-any of various double sulfates of a trivalent metal such as aluminum, chromium, or iron and a univalent metal such as potassium or sodium, especially aluminum potassium sulfate, AlK(SO4)2·12H2O
2006-12-21 17:36:27 · answer #4 · answered by Ms. M 3 · 0⤊ 0⤋
I bought a couple albums years ago - Pink Floyd's dark side and the Beatles let it be. That's all I know.
2006-12-21 14:39:42 · answer #5 · answered by Maggie 5 · 0⤊ 0⤋