ION CONCENTRATION (March 10th,2011)

Today we learned about Ion concentration!


Involved with Ion Concentration is Dissociation.
Dissociation:

• Ionic compounds that are made up of 2 parts 
• An ionic compound is a chemical compound in which ions are held together in structure by ionic bonds. Usually, the positively charged portion consists of metal cations (positively charged particles) and the negatively charged portion is an anion (negatively charged particle.)
• When ionic compounds are dissolved in water, the cation and the anion separate from eachother.

Becareful because...

Dissociation is not Decomposition! When dissociation happens the ionic compounds separate from eachother, while decomposition in which organic material is broken down into simpler forms of matter.

• When writing dissociation equations, the atoms and charges MUST BALANCE

Here are a few examples:

• If the volume does not change then the concentration of individual ions depends on the balanced coefficient in the dissociation equation

Determine each of the following ion concentrations when the following solutions dissociate:

a) 0.250 M solution of KOH

b) 0.56 M solution of Fe(OH)3

c) 50.0 mL of 1.50 M NH4Cl is mixed with 75.0 mL of 1.25 M Ca(No3)2

Here's how to do Letter A:

Here's how to do letter B:

Here's how to do Letter C:

And that is all!

Post by Ren Ren Flores