The sponge comprises of cellulose, which is made of carbon, hydrogen and oxygen. As sulphuric acid desires to react with water so badly, it in fact rips the hydrogen and oxygen molecules off the cellulose, affecting it to crumble.
The footage is pretty splendid anyway, but when you know what’s going on in background, we think it’s even more interesting. If there was ever a video that demonstrated why safety goggles need to be worn in the lab, this is it. The guys over at Slow Mo Lab have dispensed 98% concentrated sulfuric acid over a sponge, just to see what would occur. That poorsponge didn't stand a chance:
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