chemistry 2
posted by ralph .
The pH of a Ba(OH)2 solution is 10.66. What is the hydroxide concentration? If the solution volume is 125ml, how many grams of Ba(OH)2 have been dissolved?

pH = 10.66
pOH = 14  10.66 =3.34
(OH^) = 10^{3.34} = 4.57 x 10^4 M
Actualy, Ba(OH)2 is rather soluble BUT it does have a Ksp in my books. I assume we are to assume it is soluble.
If (OH^) = 4.57 x 10^4 M, then [Ba)OH)2] is 1/2 that or 2.28 x 10^4 M.
M = mols/L. You know M and L, calculate mols.
Then mol = g/molar mass. You know mol and molar mass, calculate grams.
Check my work carefully.
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