All About Acids and Bases What we need to know… Acids turn litmus paper _______. red blue Bases turn litmus paper _______. WHAT IS LITMUS PAPER?

INDICATORS Indicator—substance that changes color in the presence of an acid or base Types of Indicators: 1. Litmus paper 2. Bromthymol blue 3. Cabbage juice

Let’s talk about acids… Using the Bromthymol blue indicator: After an acid is added BEFORE

Let’s talk about bases… Using the Bromthymol blue indicator: After an acid is added BEFORE

In the lab… Test your unknown substance. Record your results. Pick up your own trash…do not leave your used litmus paper on any lab table. At your station, use the blue and red litmus paper. If your blue litmus paper turns red, it’s an acid. If your red litmus paper turns blue, it’s a base. Test your unknown substance. Record your results. Decide if the substance is an acid or a base. Make a prediction. Find its true identity.

I can… List 3 properties of an acid and a base. Give examples of household items that are acids and bases. Identify 3 types of indicators. Use litmus paper to determine if an unknown object is an acid or a base.

Let’s race! Savannah puts ketchup on her hamburgers. The ketchup has a pH of 4. What is the ketchup? ACID

Let’s race! Baking soda is an example of… BASE

Let’s race! Charlie found a bottle with a warning label that read: CAUTION—Contents inside will react with metal. What is inside the bottle? ACID

Let’s race! OH- is a compound that _____ produce when dissolved in water. BASES

Let’s race! Tums would be an example of… BASE