Things that taste sour, and things that feel slippery. The two are opposites. And mixed, they cancel each other out.
I dropped this and that into cabbage water
A board to adjust
What colour does each thing turn it?
I put a piece of marble in vinegar
A board to run
In the next cup is boiled egg white. Change what they are soaked in and run twelve hours.
I added soapy water to vinegar a little at a time
A board to adjust
How will the colour change? Press the dropper until it is exactly purple.
From here numbers and particles come into view
What comes next in middle school · chemical reactions
Acid particles and base particles
It is the cup you mixed above. How strongly acid something is, is measured by a number called pH. Seven is the middle; smaller is acid, larger is basic. Inside the cup, particles are pairing off.
The cup from above
A board to adjust
This time there is a pH number. Choose how many drops of acid and of base to add.
