Instructables
Picture of How to make sodium hydroxide
These are the thing you need to make sodium hydroxide
any type of container 
2 carbon electrodes (you can get these from zinc-carbon batteries)
alligator clips
water
salt (non iodized salt)
power source (i used a 9v battery) 

This is my 2nd instructable so dont expect it to be good
 
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Step 1:

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First you need to get water and put it in a container then mix salt (sodium chloride)  in it (make sure the salt isn't iodized)

Step 2:

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Next put the 2 carbon rods in the water and then apply power 
(do this for about 7 hours then let the rest evaperate)

Step 3:

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you are electrolyzing the salt water solution and the sodium chloride is breaking up into sodium and chlorine (warning this is giving of chlorine gas)

He is what is going on
2NaCl(aq) + 2H2O(l) => H2(g) + Cl2(g) + 2NaOH(aq)
ascas110 days ago
Will it work with copper rods
transistor27 months ago
what can i use it for

You can use it to make soap.

ilike2pokypoky (author)  transistor27 months ago

you can use it to dissolve glass and lots of other stuff

http://www.youtube.com/watch?v=nmktRTHL1NA

rimar20007 months ago

Interesting, thanks for sharing.

carlos66ba7 months ago

Why is there an arduino? No functionality whatsoever related to it.

Todd Gehris7 months ago
What is with the arduino? If your setup draws too much amperage can't that be damaged? A wall wart or old PC power supply might would work good and you wouldn't risk damaging anything.