I'm doing a solution of 5M NaOH and don't know how to eliminate it. I think maybe pouring it down into the drain isn't a very good option.
Neutralizing with an acid to pH=7.
Example: NaOH+CH3COOH = CH3COONa+H2O.
The pH of sodium acetate will never be 7, because sodium acetate hydrolyzes at alkaline pH. It is true, the alkalinity of the formed sodium acetate is not harmful, so it had to be poured into drainage. Similar situation is with citric acid. Both acetic and citric acid can be used to neutralize NaOH. However, If you used dilute hydrochloric or sulphuric acid (phosphoric acid), and neutralize with those, the neutral pH could be available.
Even one thing, you can use the keeping in air the open bottle for several days, when sodium hydrogen carbonate solution is formed with the carbonic acid content of the ir. It can also be put into drainage.
But, the best solution is, if you use it as household cleaning agent to remove fatty contaminants from oven - with keeping in mind that it is a strong alkaline material and save your eyes (NaOH soln. is the main active ingredient of household cold fatty dissolvers). If you put some washing up gel into the NaOH solution, that will be a perfect household cleaning agent.
NaOH + HCl → NaCl (salt) + H20 (water)
Add muriatic acid into the solution, mix and add until the ph is 7. HCl and NaOH are commonly used to balance pools safely, the reaction is non violent and produces heat proportional to NaOH concentration.
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