Definition: pH (potential
of hydrogen) is a scale of acidity
from 0 to 14 with 7 being neutral.
All solutions have a pH. Acid solutions, have lower pH. Alkaline solutions,
have higher pH. Substances that aren't acidic or alkaline
(that is, neutral solutions) usually have a pH of 7. Acids have
a pH that is less than 7. Alkalis have a pH that is greater than 7.
Write down the 15 substances
from the diagram and beside them list their pH level.
List them under 2 headings. 1. Acidic 2. Alkaline
Experiment: Red Cabbage indicator.
Equipment:
Red Cabbage
Knife
Bunsen Burner
Beaker
Water
Method:
Cut the cabbage into small pieces.
Place the cabbage in the beaker
and fill it with 50 ml of water.
Once the cabbage has boiled for 2 mi
nutes turn it off and leave it to cool down.
Once it has cooled remove the cabba
ge leaves and use the red water as an indicator.
Complete the quiz below:
The ph scale ranges from what numbers?
Name 4 substabces that are acidic?
Name 4 substances that are basic?
Name another pH indicator used in a science lab?
By using red cabbage as an indicator we
can determine what the pH level is of substances.
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