Now you can make your own rainbow
and carry it around with you...
- Dissolve 20 g sugar in 40 mL of NaOH solution
and add 5 - 6 drops of Universal Indicator.
- Pour into a 100 mL measuring cylinder.
- Layer with 20 mL of equal strength acid
containing Universal indicator by tilting the cylinder and dribbling
the acid down one side. Don't get acid on you!
- Leave to settle for 10 minutes.
The Sodium Hydroxide (NaOH) solution is an alkali.
Because of the dissolved sugar, it settles to the bottom of the
cylinder. The acid floats on top as it is less dense.
The clever bit is using the Universal Indicator
solution. Universal indicator is red
in acid, green
in neutral solutions, purple
You might have noticed that when the acid and base
meet, they cancel out each other leaving a green coloured neutral
solution in the middle. So a base is an acid opposite.
FIND OUT MORE:-
- Read more about acids
and bases here.
- Tannic acid can be used to make a type of ink. Try it out here...
- Make your own indicator using plant dyes.
- Learn about real
- The interactive pages...identify these pieces of lab
- The interactive pages...weird metals and gases hide
in this Periodic Table
Science Activities and Technology Projects