Homework Help: Chemistry

Posted by Jo on Saturday, July 28, 2012 at 12:04am.

Use Ksp to find the concentration of an ion in a saturated solution. Consider a 2.50E-3 M solution of Al2(SO4)3.

(a) What [OH^-] is required to initiate precipitation of Al^3+ from the solution?

(b) What [OH^-] is required to lower the [Al^3+] to 2.00E-7 M ?

Chemistry - DrBob222, Saturday, July 28, 2012 at 12:23am
2.5E-3M Al2(SO4)3 ==> 2Al^3+ + 3SO4^=

Look up Ksp for Al(OH)3.
Ksp = (Al^3+)(OH^-)^3
Substitute Ksp and 2.5E-3 and solve for OH^- for part A.
b. I assume this is a different problem and the Al is as quoted in part b and has nothing to do with part a.
Substitute for Ksp ad 2E-7 and solve for OH^-

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