# What precautions should be taken when preparing a concentrated solution of sodium hydroxide?

Sep 29, 2016

I do not need to tell you to wear spex and a lab coat. Take $120 \cdot g$ of caustic soda in a large beaker ($500 - 1000 \cdot m L$), and add $50 \cdot m L$ or so of water, and STEP BACK.
Once the initial reaction is over, the volume can be made up to $100 \cdot m L$ by adding the lye to water, never the reverse (i.e. as you would to dilute an acid!). But please remember this is a zippy reaction so take care.