Year 5 Kestrels have looked at more chemical reactions. We watched clear water turn blue when methylene blue was added to it.
As we were watching it, it began to become clear again!
Then Miss Edwards shook the bottle and it turned blue again!
That was amazing to see.
Then Miss Edwards kept the bottle still and we observed the liquid return to clear.
Watch the video and see for yourself.
The children observed and decided that the methylene blue was absorbed into the clear liquid or it dissolved.
They also decided that it was a reversible reaction and that is why it returned to clear (once it was not shaken any more).
This happened because oxygen was introduced into the solution (when shaken) and this made it turn blue again.