C13 Flashcards
1
Q
limestone
A
Calcium Carbonate
2
Q
slacked lime
A
Calcium Hydroxide
3
Q
quicklime/lime
A
Calcium Oxide
4
Q
How is Calcium carbonate turned into Calcium Oxide
A
- Material heated to above 825’C
-Process called calcination or lime-burning, separates CO2 from CaCO3
-Quicklime/lime is produced
-Is unstable so reacts with Co2 in air and reaction is reversed
5
Q
Is lime burning endo or exothermic?
A
Endothermic
6
Q
What is done to prevent the reverse reaction
A
Remove Carbon dioxide as it is produced
7
Q
What does Calcium Carbonate do to soil?
A
Increases pH, without making the soil alkaline
8
Q
How does Limestone help neutralise industrial waste products?
A
-It is used in stacked gas scrubber to reduce sulfur dioxide emission with the SO2 reacting with the CaCO3 to form solid Calcium Sulfite
-Flue-gas desulfurization involves spraying acidic sulfur dioxide with jets of CaC03 to reduce pollution by neutralising these gases before they are release.
