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
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)
what can i use it for
To make soap


ilike2pokypoky (author)  transistor21 year ago

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


Sorry, but your not going to dissolve glass with just sodium hydroxide.
It will dissolve glass if the sodium hydroxide is heated to its melting point.... And eventually destroy tue container you are hearing it in
You can use it to make traditional german pretzels, or soap, or (assuming you've obtained nearly 100% pure NaOH) you can perform an acid-base titration to (almost perectly) calculate the exact number of the molecules of a certain acid in almost any solution you'd like to know (using an indicator such as phenolphthalein)(and a graduated burette)(and a very very accurate scale, maybe accurate to like 6 to 7 significant figures)(basicly just need access to your college's chemistry lab)

you can also usee it to neutrolize HCl thet hets formt when Cl hit water (H2O).
it will then turn Cl back into NaCl and water

You can use it to make soap.

rimar20001 year ago

Interesting, thanks for sharing.

carlos66ba1 year ago

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

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.