Acids and Alkalis

Unit E

Do Now:• Match the acid with the chemical formula:

Hydrochloric Acid H2SO4

Nitric Acid HCl

Sulphuric Acid HNO3

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