The acidity of a solution is measured by its pH, which is given by the formula below, where H+ measures the concentration of hydrogen ions in moles per liter.
pH=-log(H+)
The pH of pure water is 7. A solution is referred to as acidic if its pH is below 7 and as basic if its pH is above 7.
a.) How many moles of hydrogen ions are contained in a liter of acid rain that has a pH of 3.0
b.) If the pH of a solution increases by 3.0, then the concentration of hydrogen ions increase or decrease to ______ of the original amount.
pH=-log(H+)
The pH of pure water is 7. A solution is referred to as acidic if its pH is below 7 and as basic if its pH is above 7.
a.) How many moles of hydrogen ions are contained in a liter of acid rain that has a pH of 3.0
b.) If the pH of a solution increases by 3.0, then the concentration of hydrogen ions increase or decrease to ______ of the original amount.
-
a)
3 = -log([H+])
-3 = log([H+])...you now need to put 10^-3 in your calculator (or know it is .001)
.001 mol/liter = [H+]
b) Since the pH scale is a log scale, each unit represents a factor of 10. An increase of 3.0 (becoming more basic) means the concentration of H+ has decreased by a factor of 10^3 = 1000. It is now .001 times the original amount.
3 = -log([H+])
-3 = log([H+])...you now need to put 10^-3 in your calculator (or know it is .001)
.001 mol/liter = [H+]
b) Since the pH scale is a log scale, each unit represents a factor of 10. An increase of 3.0 (becoming more basic) means the concentration of H+ has decreased by a factor of 10^3 = 1000. It is now .001 times the original amount.