In chemistry, the acidity of a liquid is commonly measured in pH. pH is important outside of chemistry to many things, including keeping swimming pools maintained, and measuring the acidity of rain. The pH scale is related to the concentration of hydrogen ions in the liquid, a number that tends to be very small, so the pH scale was introduced to make the numbers easier to work with. For a given concentration of hydrogen ions, H, measured in Molars, the pH is determined by pH = -$\displaystyle {{\log}_{{10}}}$(H)

1. Tap water has a hydrogen ion concentration of about 10^-6.6 M.  Find the pH of tap water.
   
   
2. Sea Water has a hydrogen ion concentration of about 10^-7.7 M.  Find the pH of Sea Water.
   
   
3. Beer has a pH of about 4.3.  Find the concentration of hydrogen ions, to 5 decimal places.
   Preview Question 6 Part 3 of 4  
4. Given the results of parts a and b, how would describe the relationship between the pH and the power of ten of the concentration of hydrogen ions?
   Keep in mind what it means to be a logarithm.
   

Reference: EPA pH examples