There are many chemical reactions that will produce sodium hydroxide, but I will list a couple of options.
1) 2Na + 2H2O → 2NaOH + H2
Sodium react with water.
2) Na2O + H2O → 2NaOH
Sodium oxide react with water.
3) NaCl + H2O → NaOH + HCl
Sodium chloride react with water.
4) NaH + H2O → NaOH + H2
Sodium hydride react with water.
The coefficients in all equations are arranged, nothing needs to be added.
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