Oh, yes, I can see that it could be hazardous with children about. I'm "old," kids are gone and I live way out in the desert on a long dirt road, so I don't have those considerations to deal with.
What's even better is, as opposed to south Florida where the soil was extremely acidic, the desert soil is extremely alkaline so, when I want to get rid of the acid, I just throw it on the ground and they neutralize each other. Fun to watch it bubble and fizz.
It always amazes me that it never seems to have the slightest effect on the desert weeds.