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.

since the atomic number is the number of protons in the nucleus, as we move to the left on the periodic table, the electrostatic pull between the nucleus and the valence electron shell decreases. as we move down a group (vertical column), the valence shell energy level gets further and further from the nucleus.