Unit Five

Solubility Equilibrium

Review ___________________ a substance which

dissolves to yield a solution with ions that can conduct electricity

Eg. (NH4)3PO4(s) 3NH4+

(aq) + PO43-

(aq)

HCl4(g)

C2H2(g)

An _______ solution contains ions.

An ______________ solution contains only neutral molecules.

How do you know if a compound will form an ionic or molecular solution?These are some guidelines, but there are

exceptions:

_______ compounds consisting of a metal and a non-metal are likely to form ionic solutions

Eg. FeCl3(s) Fe3+(aq) + 3Cl(aq)

A compound with ___________________ ions will likely from an ionic solution

Eg. (NH4)2Cr2O7(s) 2NH4+

(aq) + Cr2O72

(aq)

NOTE: In Chem. 30, we will only be working with compounds with 1+ and 1- ions.

Eg. NaH3P2O7(s) Na+(aq) + H3P2O7

(aq)

_______________ compounds (AKA covalent compounds) made of 2 or more non-metals, especially _________________ compounds are likely to be a molecular solution

Eg. ClO2(l) ClO2(aq)

Eg. CH3OH(l) CH3OH(aq) (organic b/c it starts with C)

In Chemistry 20… The _______________________ of a substance

is the maximum amount of the substance which can dissolve in a given amount of solvent @ a given temp.

A solution which has dissolved the “max. amount” of a substance is said to be ____________________.

Once a solution has been saturated the addition of more substance will cause it to sink/float undissolved in the solution.

In Chemistry 30…The _____________________ of a substance is

the __________________ concentration of the substance @ a given ______________

The solubility is referred to as the ____________ solubility where the [] is expressed as “moles/litre”

A substance is said to form a saturated solution if the dissolved substance is in _____________ with some of the __________________ substance.

Saturation exists when:some undissolved material is present equil. Exists b/t the dissolved and

the undissolved materialEg. AgBrO3(s) Ag+

(aq) + BrO3(aq)

Dissolving equation

A Closer LookIn the beginning… AgBrO3(s) Ag+

(aq) + BrO3(aq) = dissolving rxn.

Then… Ag+

(aq) + BrO3(aq) AgBrO3(s) = ________________

rxn.

Eventually…

AgBrO3(s) Ag+(aq) + BrO3

(aq)

Assignment “Solubility Equilibrium I”

handout; Q 1 – 7.