Chapter 9 - Solutions, Acids & Bases |

pH and Indicators |

pH (small p capital H) is the measure of how acid or base a solution is. The lower the number the more acid it is and the higher the number (up to 14) the more base the solution is. A pH of 7 is considered neutral, this means it is both acid and base. |

The pH scale is a **reverse logarithmic **scale that

measures the number of**hydronium ions. **This

hydronium ions in the solution goes down.\

**Reverse logarithmic means:**

1 = 10 to the power of -1 0.1

2 = 10 to the power of -2 0.01

3 = 10 to the power of -3 0.001

and so on

so as the number gets higher the number of

hydronium ions gets less.

measures the number of

hydronium ions in the solution goes down.\

1 = 10 to the power of -1 0.1

2 = 10 to the power of -2 0.01

3 = 10 to the power of -3 0.001

so as the number gets higher the number of

hydronium ions gets less.