Can I touch something that's been dipped in a weak Potassium Hydroxide solution?

Question

Hi. I've mixed up a relatively weak solution of potassium hydroxide and water (to use as electrolyte) and I'm aware of the dangers involved and the safety measures required for handling the stuff but I'm wondering is it safe to touch something that's been dipped in the solution and since dried or do I need to be just as careful?

Answer 1

You ask, "Can I touch something that's been dipped in a weak Potassium Hydroxide solution?"

And I respond, "Sure.  Once."

Seriously, you can touch it, and perhaps some solid will be transfer to your skin.  Unless your skin is wet or you are sweating profusely because of the fear of touching tried bases, then nothing much will happen.  

It's only when the dried base rehydrates is there potential for irritation of the skin.  Even at that, you'll get a soapy feel and you'll wash it off and everything will be fine.  It would take a lot to dissolve your hand, and even then it would turn to soap.  (Remember that episode of CSI with the body in a 55 gallon drum of NaOH?)

You hands are covered in dead skin cells that make a pretty good barrier to acid or base.  I demonstrate to my students how easy it is to touch acids and not get a response by holding a puddle of 1M HCl in the palm of my hand.  There is no pain or irritation as long as it stays over the region of mostly dead skin.

Answer 2

Be careful anyway when you're handling base. I it's dried, but not washed, there may be traces of crystallized base on the object, which can still burn. It is best to either wear gloves, or rinse the object well with water before touching it.