The pH scale

Substances can be classified as _________, ___________, or ___________ based on their pH.

The pH range of a solution is between __ and ___.

The pH for water is 7. Any solution with a pH of 7 is a _________ ___________.

The pH of an _________ __________ is less than 7; the _______ the number, the more acidic the solution.

The pH of a _____ is greater than 7; the __________ the number, the more basic the solution.

Acids can be identified by their _______ taste (lemons and oranges), by their reaction with some ________ such as zinc, and by their reaction with bases to form a ________ pH solution (vinegar and limestone)

Bases can be identified by their _____ taste (unsweetened cocoa butter), by its ___________ feel (dish detergent), and by its reaction with acids to form a _________ pH solution (an antacid and an acid stomach)

A neutral solution is neither a acid nor base, For example, _______ is a neutral solution and has a pH of 7.

___________ are substances that can be used to determine whether a solution is acidic, basic, or neutral.

Types of indicators: 1) Litmus paper It has special dye on it that changes colors in the presence of an acid or base. Blue litmus paper turns _____ in an acid, and stays ____ in a base. Red litmus paper turns ____ in a base, and stays ___ in an acid. Both red and blue turn ______ in a solution that is neutral. A way to remember: _____, ______, ____

2) Phenolphthalein It is used to test for the presence of a ______. It is a colorless chemical that changes color in the presence of a base.

3) pH paper Has a range of colors depending on the ____ of a solution. The color of the paper is compared to the ______ on the vial to determine the pH.