Acids and Bases: Concentration

What is concentration?

Concentration is the amount of substance dissolved in a fixed volume of solution. In other words it's: 

Amount of substance / Volume of solution

Main Points:

• The strength of the acid is relative to the % dissociated

That's why even if the acid has higher strength, if the concentration is higher, it can have a lower pH. This is the formula for pH by the way:

Anything with square brackets mean it's "concentration of" apparently.

• The concentration of H+ ions determines the pH

There are always H+ ions and OH- ions in every acid. The weaker the acid, the higher the amount of OH- ions and the lower the amount of H+ ions. Therefore, your H+ ions are relative to your acidity and the OH- ions to your basicity. 

If you still don't get it it's fine. Just remember that the higher the concentration of H+ ions, the lower the pH. 

Other points:

• pH is only dependant on the concentration of H+ ions.
• pH is non-linear