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# Solubility Ksp Calculations

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How do you complete a solubility Ksp problem?

What is the solubility of aluminum hydroxide in water at 25 degrees Celsius if the Ksp is 3 x 10^-34? What is the concentration of Hydroxide at equilibrium?

What is the concentration of a sulfide ion in a 1L solution of cuprous sulfide to which .03mol of cuprous nitrate has been added? The Ksp of cuprous sulfide is 8 x 10^-37

https://brainmass.com/chemistry/chemical-equilibrium/solubility-ksp-calculations-41505

#### Solution Preview

The solution is attached.

Thanks for the good questions.

First you need to write and balance the precipitate dissociation reaction.

Aluminum Hydroxide - my first question is, what is the compound formula?
If I do not know there are a number of routes to the answer. One is an internet search and the formula is Al(OH)3

So we have Al(OH)3-----------> Al(III) + 3OH(-)

Ksp = [Al(III)][OH]^3 where the brackets signify concentration

Now the Ksp on order of 10^(-34) means this barely dissociates in water at 25C.

If we start with 1 mole of aluminum hydroxide in 1 Liter water or 1M, we see ...

#### Solution Summary

This solution is provided in 480 words in an attached .doc file. It uses the balancing of the precipitate dissociation reaction as a step to solving the problem.

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