Homework Help: ap chemistry

Posted by brian on Tuesday, October 19, 2010 at 9:40pm.

A solution is prepared in which a trace or small amount of Fe+2 is added to a much larger amount of solution in which the [OH]- is 1.0M*10^-2. some Fe(OH)2 precipitates. the value of Ksp for the salt is 8.0*10^-10. assuming that the hydroxide ion concentration is 1.0M*10^-2 calculate the Fe+2 concentration.

ap chemistry - DrBob222, Tuesday, October 19, 2010 at 10:00pm
Ksp = (Fe^+2)(OH^-)^2 = 8.0E-10
Plug in 1.0E-2 for (OH)2 and solve for Fe^+2.
ap chemistry - brian, Tuesday, October 19, 2010 at 10:22pm
I got 8*10^-8
Is this correct?
ap chemistry - DrBob222, Tuesday, October 19, 2010 at 10:23pm
I think so.
ap chemistry - apchem, Tuesday, April 23, 2013 at 10:42am
it's 8*10^-6 because the hydroxide concentration is squared. trust me, we went over this in my ap chem class (I got that originally wrong too)

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