Burst your bubble

The video tutorial demonstrates an experiment using a bottle, 9-volt batteries, and stainless steel nails to perform electrolysis. The batteries are connected in series to the nails, which are submerged in water mixed with Borax, an electrolyte that enhances conductivity. The process splits water molecules into hydrogen and oxygen, which form bubbles that rise to the surface. These gases can be ignited with a match, demonstrating the principles of electrolysis and gas collection.

Describe how hydrogen and oxygen are collected in the experiment.

What safety precautions should be taken when igniting the mixture of hydrogen and oxygen?