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Chapter 10

Lime

QuestionAnswer
Uses of limestone blocks for buildings, lime for mortar, concrete
Who discovered concrete and when? Romans, 200BC
Uses of gypsum Plaster, stucco, sheetrock
When was plaster discovered? ~7000BC
What family of minerals is gypsum from? CaSO4
Anhydrite CaSO4
Bassanite CaSO4 . 1/2H2O aka plaster
gypsum CaSO4 . 2H2O aka alabaster
How does gypsum become plaster? Heated to 128C CaSO4.2H20(s)=CaSO4 .1/2H20(s)+3/2H20(l)
Plaster becomes anhydrite at... 168C CaSO4.1/2H20(s)=CaSO4+1/2H20(l)
Anhydrite slowly reconverts to plaster... CaSO4(s)+1/2H20(s)=CaSO4.1/2H20(s)
Plaster quickly reconverts to gypsum CaS04.1/2H20(s)=CaS04.2H20(s)
Family of minerals that limestone is from... CaCO3
calcite and aragonite CaCO3 (atoms arranged slightly differently)
dolomite CaCO3.MgCO3
Limestone comes from... sediment, seashells, insoluble in water
Limestone to quicklime CaCO3(s)=(burn)CaO(s)+CO2
Quicklime to slaked lime CaO(s)+H2O(l)=Ca(OH)2(s)
slaked lime and carbonic acid limestone
Carbonic acid H2CO3
process schematic go look, silly
Created by: Knaomi
 

 



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