Asked by LT
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
How do i start this problem. please
Answers
Answered by
DrBob222
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.
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.
Answered by
LT
I follow you so far but how do you calculate OH
Answered by
DrBob222
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<sup>x</sup> 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.)
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<sup>x</sup> 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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