Dissolving Natrium (sodium) hydroxide to 0.1 M concentration

Dissolving concentrated NaOH 4 grams in 25mL solution into a 1 liter volumetric flask to make 0.1 M NaOH solution, which is required for weak acid-strong base titration experiment. Danger!!! This is a harmful substance. Another way you can make sodium hydroxide is dropping pure sodium metal into distilled water, but this is highly unrecommended because it is dangerous.
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