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Originally Posted by Scrappin' Sifu

Actually I had always just been concerned that adding water to acid would cause the acid to splash out, whereas adding acid to water would cause only water to splash. I thought the heat exchange would be the same, but it's been a while since I took chemical thermodynamics.

It's the addition of small quantities of water to acid that causes releases heat energy that is enough to cause the water to instantly boil and thus spatter. But if you add a small amount of acid to water it doesnt boil so doesnt spatter (dont hold the container whilst doing this though -it still gets hot enough to burn you) This concept is similar to water into into boiling oil -spatters all over the place. But if you drop boiling oil into water slowly it won't.