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Topic: calculating pKsp  (Read 23393 times)

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Offline Dekka

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calculating pKsp
« on: December 19, 2009, 09:50:36 PM »
Hi all,

I know how to go about calculating Ksp (and then taking the -log to get the pKsp) if I know the substance.

The question is ' a saturated sol'n of mystic hydroxide has a molar concentration of 0.0037.  Calculate the value of the hydroxide.

My(OH)4.'

Any suggestions on how to start this?
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Offline sjb

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Re: calculating pKsp
« Reply #1 on: December 20, 2009, 05:03:38 AM »
What value of the hydroxide? Concentration? Ksp? Bond length?
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Offline Borek

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Re: calculating pKsp
« Reply #2 on: December 20, 2009, 05:17:53 AM »
Assuming it is Ksp - write reaction equation for hydroxide dissolution. Can you use reaction stoichiometry to calculate concentrations of all ions involved?
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Offline Dekka

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Re: calculating pKsp
« Reply #3 on: December 20, 2009, 05:12:02 PM »
I can.. My2(OH)4------> My4+   + 4OH

But really I don't know where to go from here.  (there is no more information in the question)
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Offline Borek

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Re: calculating pKsp
« Reply #4 on: December 20, 2009, 05:28:22 PM »
OK. You are given solubility, can you calculate concentration of My4+ & OH-?

Can you write formula for Ksp?

(Note: I suppose My2 is just a typo).
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