Amazing Science: How to make soap from recycled oil

Today we’ve made soap from recycled oil! This laboratory experiment is part of our Polar Bear Project.
Students from the 1st year of A levels have shown us how to make soap.
This is their recipe:
250 g of recycled oil
250 ml H2O
5 g salt
35 g caustic soda
some drops of lavender water

It has been so amazing!
Look at the pictures.