• pH is below 7

• Acids have a sour taste

• They react with metal to produce hydrogen gas

• They react with bases to form a neutral solution

• Ex: vinegar, lemon juice, HCl

• pH is above 7

• Bases have a bitter taste

• Bases feel slippery

• They react with acids to form a neutral solution

• Ex: baking soda, soap, bleach

Red Litmus Paper tests for a BASE.

• stays red/pink in acid

• turns violet (sometimes) in a neutral solution

• turns blue in a base

Blue Litmus Paper tests for a ACID

• turns red in an acid

• turns violet (sometimes) in a neutral solution

• stays blue in a base

pH Paper tests for ALL RANGES OF pH

• you compare the ending color of the paper to the scale provided on the package that the paper came in. This will tell you the pH.

• The example in the picture above shows a substance that is at a pH of about 7 because the paper turned a light green. According to the scale provided, light green means a pH of 7.

Phenolphthalein tests for a BASE

• the clear liquid stays clear in an acid

• the clear liquid stays clear in a neutral solution.

• the clear liquid turns magenta (pink) in a base.