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1/.12 = 8.3333333333

This is the dilution factor you need to achieve.

250ml / 8.333333 = 30ml.

This is a very important concept for chemistry so it may be important to try this method. The logical way works for me.

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Q: How many ml of 1m naoh do you need to add to a 250ml flask to make a 0.12 m naoh solution?
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