Introduction: Acid Rain video
.......followed by this video on acids.
Watch this video: What makes something acid?
Answer the questions: Properties of acids
What makes something acidic?
What are 3 examples of acids?
What are some natural acids?
What is the pH scale?
What does pH stand for?
p stands for __ph____________.
H stands for _____________.
What is the most famous indicator?
How many numbers are there on the pH scale?
What are the numbers for an acid?
What numbers are for a base / alkaline?
What flavour are acids?
Aim: To make red cabbage pH indicator for use on different household chemicals.
Red Cabbage Indicator experiment
Materials
Red Cabbage
Beaker
Bunsen Burner
Pipette
Sodium Hydroxide
Hydrochloric acid
Test Tubes ( x5)
Paper towel
Test tube rack
Water
Steps
Chop up the red cabbage into small pieces. Place in a beaker and cover with a small amount of water.
Bring the solution to the boil using a bunsen burner
and then turn off the heat. Let it sit to cool down.
Pour the cabbage water through a paper towel into a beaker. The dark
purple liquid in the jar is the pH indicator liquid.
Suck up the indicator into a pipette.
In a test tube, use the cabbage indicator and the pH
chart below to test the acidity of the the hydrochloric acid and ammonium hydroxide.
Findings.
What is the pH of liquids.
Sodium Hydroxide
Hydrochloric acid
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