pH

pH is a measure of H(+) concentration on a scale from 0-14
0- means there is more H(+)
7- means it is neutral, no acid, no base H(+) = OH(-) it is balanced
14- means there is more OH(-)

0-7 is an acid
7-14 is a base

The p in the pH means negative log of something

Log function:
log(10) 100 = 2 --> 10^2 = 100
log (10) 1,000,000 = 6 --> 10^6 = 1,000,000
log (10) 1,000 = 3 --> 10^3 = 1,000

pH 3 compared to pH 4
1)Which is more acidic?
     pH 3 is more acidic
2)By how many x's?
     by 10x