The Ksp of Al(OH)3 at 25 oC is 1 x 10-33. Consider a solution that is 1.0 x 10-10 M Al(NO3)3 and 1.0 x 10-7 M NaOH. Selected C. Q > Ksp and a precipitate will form. Correct C. Q > Ksp and a precipitate will form.

Answer : and a precipitate will form.

Explanation : Given,

Concentration of =

Concentration of =

of =

The equilibrium chemical reaction will be:

The expression of Q for this reaction is:

Concentration of = Concentration of =

Concentration of = Concentration of =

Now put all the given values in this expression, we get:

There are 3 conditions:

When ; the reaction is product favored.   (No precipitation)

When ; the reaction is reactant favored.   (Precipitation)

When ; the reaction is in equilibrium.  (Sparingly soluble)

As, the is more than . The above reaction is reactant favored. This means salt or precipitate will be formed.

Hence, the and a precipitate will form.

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