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If calcium hydroxide has a Ksp value of 5.5*10^-6 and magnesium hydroxide has a Ksp value...

If calcium hydroxide has a Ksp value of 5.5*10^-6 and magnesium hydroxide has a Ksp value of 1.8 * 10^-11, which metal hydroxide would you expect to precipitate first and why?

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Answer #1

look at the definition of Ksp

Solubility product constant is simplified equilibrium constant (Ksp) defined for equilibrium between a solids and its

respective ions in a solution

lets write the first equation

Ca(OH)2 <======> Ca2+ + 2OH-

Ksp = [Ca2+] [OH-]2 / [Ca(OH)2]2

suppose numanater value is more Ksp value is more

numanater means ions concentration that means Ca(OH)2 concentration will be less that means less possibility of precipitation

from this i can write one satement that more Ksp value less will be the precipitation chances

out of these two Ca(OH)2 is more value than Mg(OH)2

so Mg(OH)2 will precipitate first

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