Instructables
Picture of How to separate water
Here's a quick cheap way to get some hydrogen and oxygen.
 
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Step 1: Gather the items

Picture of Gather the items
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You will need 2 pencils,a cup,some cardboard,salt,a 9-volt battery,a 9-volt battery connected, and a pencil sharpener.

Step 2: The pencils

Picture of The pencils
Sharpen both ends of both of your pencils.Try to have the graphite in the pencil as long as you can.Then cut the cardboard so it comfortably fits on top of your cup.

Step 3: Setting it up

Picture of Setting it up
Fill the cup half full with warm water, Mix about 1 teaspoon of salt into the water.Then wrap some of the wire around one end of both the pencils. Attach the other end to the battery. Then you can push the pencils through the cardboard into the water. You will see bubbles around the tip of the pencil.
cal2878 months ago
Does the same work without adding salt?
dboss28 months ago
There will also be a certain amount of chlorine gas from the salt.
What happens after I see bubbles? Thanks

then you add some dish soap to the water, and watch flammable bubbles form.

The Bubbles are Hydrogen and Oxygen. If you can collect them from each pen seperatly by using pvc-tubes, you can use them for other experiments. e.g. hydrogen has a lower density then air, a balloon would float if it was filled with H.

simmew2 simmew28 months ago

ps: oxygen will appear at the positive lead, negative leads to Hydrogen.

francisdsa8 months ago
smile.