My understanding of the water/acid rule was that it was possible to generate enough energy from the reaction that it would sometimes cause the water to actually heat to the boiling point, go gaseous and splatter. It was therfore better to be splattering a solution of mostly water than acid, hence the saying “Do what you oughta, add acid to water.”
Getting back to my original question: Have you ever seen the high speed films of a water droplet hitting a pool of water? Where immediately after the drop hits the water, a somewhat smaller drop “bounces back” and basically flies up out of the ‘hole’ that the first drop made? It’s the composition of that second “bounce back” drop that is the key. Unfortunately, all the pictures I’ve ever seen have been where the liquid of the falling drop is the same as the liquid in the pool.
Maybe this weekend I’ll try and get some food coloring and try out Catalyst’s idea.
And bughunter: Never underestimate my morning emiction. Remember that little earthquake Chicago had a month or so back? That was me taking a whizz. The flooding of the Des Plaines river? That was me too…