rocketxscience Posted January 5, 2009 Share Posted January 5, 2009 Hello! I have a little question about the solubility of calcium hydroxide.. Does the solubility decrease or increase when the temperture is raised? Your help will be very much appreciated! Thank you! Link to comment Share on other sites More sharing options...
bob000555 Posted January 5, 2009 Share Posted January 5, 2009 Solubility of solids and liquids in water increases with temperature solubility of gasses in water decreases with increased temperature. The answer is the solubility of calcium hydroxide increases with increased temperature. Link to comment Share on other sites More sharing options...
Aaron_S Posted January 5, 2009 Share Posted January 5, 2009 Solubility of solids and liquids in water increases with temperature solubility of gasses in water decreases with increased temperature. The answer is the solubility of calcium hydroxide increases with increased temperature. Really? cerium(III) sulfate decreases it's solubility with temperature, sodium sulfate also starts to become less soluble after ~30C. But I think that calcium hydroxide get's more soluble when heated. Link to comment Share on other sites More sharing options...
CharonY Posted January 5, 2009 Share Posted January 5, 2009 Solubility of solids and liquids in water increases with temperature solubility of gasses in water decreases with increased temperature. This is an oversimplification. What is [math]\Delta[/math]H in this case? Link to comment Share on other sites More sharing options...
CaptainPanic Posted January 6, 2009 Share Posted January 6, 2009 Why would you want to know the enthalpy change ([math]\Delta{H}[/math])? It just says how much heat develops (whether it cools or heats) when you dissolve the [ce]Ca(OH)2[/ce]. I don't recommend trying to derive this from thermodynamic formula's. Either look it up, or measure it. The easy way is to search in a Handbook, such as Perry's Chemical Engineers' Handbook. Since you probably don't have that book, and I do, I looked it up for you. Solubility of the anhydrous Ca(OH)2 (but anhydrous is the standard form - it does not have any crystal water) 0 deg C - 0.185 g / 100 g water 10 deg C - 0.176 g / 100 g water 20 deg C - 0.165 g / 100 g water 30 deg C - 0.153 g / 100 g water 40 deg C - 0.141 g / 100 g water 50 deg C - 0.128 g / 100 g water 60 deg C - 0.116 g / 100 g water 70 deg C - 0.106 g / 100 g water 80 deg C - 0.094 g / 100 g water 90 deg C - 0.085 g / 100 g water 100 deg C - 0.077 g / 100 g water If you use this data, please include the reference: "Perry, Green, Perry's Chemical Engineers' Handbook, 7th Edition, McGraw-Hill, 1998, New York" because that's where I found this. Disclaimer, I might have gotten the official order of the reference wrong (I never know what comes first: publishers, or year or so). Link to comment Share on other sites More sharing options...
Ecap Posted January 8, 2009 Share Posted January 8, 2009 Hello! I have a little question about the solubility of calcium hydroxide.. Does the solubility decrease or increase when the temperture is raised? Your help will be very much appreciated! Thank you! The solubility should decrease with increased temperature Link to comment Share on other sites More sharing options...
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