12.3 Properties of Logarithms. Algebra 2 Mrs. Spitz Spring 2007. Objectives:. Solve equations or simplify and evaluate expressions using properties of logarithms. Assignment. Worksheet 12.3. Application.
So, log 3 (9 27) = log 3 9 +log 327)
log b mn = log b m + log b n
Property of exponents
Prop. =/log functions
Def. inverse function
. If the pH level of a lake is 5, how much more acidic is it than neutral water, that has a pH of 7?
The pH of neutral water is 7. Since , there are 10-7 gram atoms of hydrogen ions in a liter of neutral water. Similarly, since , there are 10-5 gram atoms of hydrogen ions in a liter of lake water.Ex. 2: Application/Chemistry
So the lake water is 100 times more acidic than the neutral water.
Both of these logs are undefined, so -4 is NOT A SOLUTION!