Chemistry question solubility. Ksp

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Science

Description

How many moles of Fe(OH)2 [Ksp = 1.8 × 10–15] will dissolve in 1.0 liter of water buffered at pH = 10.30?

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Explanation & Answer

pOH = 14 - 10.36 = 3.64 
[OH-] = 10 ^ - 3.64 = 2.29 x 10 ^ -4 

1.8 x 10 ^ -15 = x ( 2.29 x 10 ^ -4) ^ 2 
x = 3.429 x 10 ^ -8 
(Since this molalilty is in one liter, the molality will equal the moles so this is the final answer. )


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