While transferring NaOH solution to the pH paper, you accidentally splash it onto your skin. Check all actions you should take.

Tell your teacher immediately and rinse the exposed skin with plenty of water. NaOH is corrosive, and flushing it away with water helps limit injury. Do not apply acid to neutralize it, since the reaction can release heat and cause further harm; do not wipe it off with a paper towel and continue the experiment.

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