Applying Logs to Chemistry
Determing H+ or Hydronium Ion Concentrations

Function: 
p(H+)= - log 10 (H+)
Take the negative log of the Hydronium Ion concentration to find then pH. The reverse is 
often taken as well, determining the H+ concentration from the pH ...
H+ = 10^ (-pH)

Example:
You have a Hydronium Ion concentration of 6.5 x 10^-8. Determine the pH and whether
It is an acid or a base.
p(H+)= - log 10 (6.5 x 10^-8)
= 7.2
7.2 > 7
It is a very weak base.

* Logs are vital to chemistry when doing lab work in converting between the concentration, pH ( and even pOH) for determining reactions and amounts reacted. It can also help you work out how much you need in a solution,specifically how much a solution may be diluted for a reaction.

Prompt: 
Why is determining acids and bases important for chemistry? How does this pertain to logs? 

Reference video:
http://m.youtube.com/#/watch?v=8W2KbhC9mE0&desktop_uri=%2Fwatch%3Fv%3D8W2KbhC9mE0