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The chemicals "quick lime", "slaked lime", "lime water" and "soda lime" all have "lime" in common. What is the difference between them?

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    $\begingroup$ Aha, I wondered if this would be a self-answer -- most or all of this is on Wikipedia. $\endgroup$ – hBy2Py Jan 21 '17 at 16:00
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Quick lime is calcium oxide, $\ce{CaO}$, in the solid state.

Slaked lime is calcium hydroxide, $\ce{Ca(OH)2}$, in the solid state.

Lime water is a dilute solution of calcium hydroxide, $\ce{Ca(OH)2}$, in water.

Soda lime is a mixture of sodium hydroxide, $\ce{NaOH}$, (also known as caustic soda) and calcium oxide, $\ce{CaO}$, (also known as quicklime).

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    $\begingroup$ Thanks for posting this! Can you add links to Wikipedia or elsewhere? Most of these are on Wik. $\endgroup$ – hBy2Py Jan 21 '17 at 16:01
  • $\begingroup$ @hBy2Py, I did not refer to wikipedia. I knew this. $\endgroup$ – MrAP Jan 21 '17 at 16:02
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    $\begingroup$ You may know these things, but including links to outside sources increases the usefulness of your answer to others. $\endgroup$ – Ben Norris Jan 21 '17 at 17:36
  • $\begingroup$ Slaked lime comes from the idea of slaking the "thirst" of quick ("live" or "active") lime with water. Sort of an alchemical etymology. $\endgroup$ – James Gaidis Aug 4 at 14:39
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To add to the family of materials in the 'lime' category: The sedimentary rock limestone is composed of calcium carbonate, $\ce{CaCO3}$.

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According to Wikipedia:

Quick lime is $\ce{CaO}$ (calcium oxide)
Slaked lime is $\ce{Ca(OH)2}$ (calcium hydroxide)
Lime water is just a dilute solution of calcium hydroxide.
Soda lime is a mixture of about 75% calcium hydroxide, a few percent each of sodium hydroxide and potassium hydroxide, and about 20% water. It is commonly used to adsorb $\ce{CO2}$ from the air.

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