Homework Help: Chemistry

Posted by LT on Thursday, April 10, 2008 at 10:11pm.

a solution saturated in calcium hydroxide(limewater) has a pH of 12.35. What is Ksp for calcium hydroxide?

How do i start this problem. please

Chemistry - DrBob222, Thursday, April 10, 2008 at 10:38pm
Ca(OH)2 ==> Ca^+2 + 2OH^-

pH = 12.35
pOH = 14-12.35
Calculate (OH^-).
Convert (OH^-) to (Ca^+2)
Calculate Ksp = (Ca^+2)(OH^-)^2
Post your work if you get stuck.
Chemistry - LT, Thursday, April 10, 2008 at 10:50pm
I follow you so far but how do you calculate OH
Chemistry - DrBob222, Friday, April 11, 2008 at 1:26am
pOH = 1.65 = -log(OH^-).
Do you know how to solve that?
-log(OH^-) = 1.65
log(OH^-) = -1.65
Enter -1.65 in your calculator and hit the 10^x key. Tht will give you 0.022387 31M. (That is more places than you can use but that's the number that shows up on my calculator.)

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