Friday, 29 August 2014

Solubility and Solubility Product

The dissolving of a sparingly soluble solute can be represented by an equilibrium equation:

As this is an equilibrium, we can write an equilibrium expression, called the Solubility Product:

The smaller the Solubility Product, the less soluble a solute is.

Solubility is usually expressed in one of two units: grams per litre (g L-1); or moles per litre (mol L-1).

We can use the solubility of a solute to calculate the Solubility Product, and use the the Solubility Product to calculate the solubility of a solute. Once we master these two skills, we have a good understanding of solubility.

Ionic Product and The Common Ion Effect

Ionic Product is the same as Solubility Product, but when two solutions (of known concentration) are combined and the ions may form a precipitate. If Ionic Product is larger than Solubility Product, a precipitate does form. If they are equal, it is a saturated solution. If Solubility Product is larger, no precipitate will form.

Thursday, 28 August 2014

Aqueous Solutions Introduction - Species in Solution

This entire unit is about things dissolved in water - aqueous solutions. If they are not dissolved in water, we do not have to consider them (too much).

 The examples we need to work through by tomorrow are:

We also did a brief experiment to show why some salts are alkaliine or acidic:

Wednesday, 13 August 2014

Organic Chemistry Revision

We made hexagons to represent every functional group we studied in Organic Chemistry earlier in the year:

We are putting brief study notes on the back of these, and playing a few revision games with them: