Acids and Alkalis Unit E

Do Now: Match the acid with the chemical formula: Hydrochloric AcidH 2 SO 4 Nitric AcidHCl Sulphuric AcidHNO 3 What element do each acid have in common?

Danger in Acids! Concentrated – stronger, more pure acid – More harmful, irritant Diluted – an acid made weaker by adding water to it

Warning Signs

Activity: Cut out and match the warning sign to the hazard. Then determine an example of each.

Do Now: What common acids can you find at home?

Properties of Acids Common Acids at Home: – Citric Acid – Phosphoric Acid – Ethanoic Acid (Acetic Acid) Tastes: – Sour – Tangy

Warning!!! Do NOT try to drink an unknown liquid to find out if it is an acid!!

Activity: Sample the following liquids Create a chart describing the taste Determine which is an acid

Do Now: Glue a pH scale into your notebooks

Alkali Alkali – Also known as a base – Opposite of an acid – Used in soaps

The pH Scale Litmus Paper – turns color to determine if a substance is an acid, alkali, or neutral

Indicators Other indicators exist that test if a substance is an acid or an alkali

Activity Test each of the substances with pH paper and record the color and estimate the pH Place a drop into each substance and record the results in a table Determine which substance is an acid, an alkali and neutral

Do Now: Break up into groups of 2 1 person from the group get a laptop and log in

Activity Create a poster of the pH scale Research examples of different common substances that have different pHs and place on your poster