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It won't explode, since the water makes the acid less dense, making it not explode.

Thanx.

I hope this helps.

The answer provided by the previous poster is not entirely correct. It may not explode in the sense of an accelerating chemical reaction, but the rapid boiling of the water being added to the acid sure comes close!

The enthalpy of mixing of acid and water is usually VERY exothermic. If you add the water directly to a strong acid, the heat released by the mixing process cann be more than sufficient to boil the water - which means that it can quickly generate bubbles of steam below the surface of the acid and "explode" as the bubbles coalesce into bigger bubbles and expand with all the heat being released. If the vessel where the mixing is occurring doesn't allow for the quick escape of the steam, it will build up pressure and can explode the vessel - spraying acid all over - not a pleasant thing to have happen to say the least!

I once made the mistake in an organic chemistry lab of mistakenly grabbing a bottle of concentrated sulfuric acid (a very strong acid with a high enthalpy of mixing) instead of the bottle of glacial acetic acid (think concentrated vinegar - much lower enthalpy of mixing) that was located next to it. When I tried to quickly mix 50 ml of water with 50 ml of acid, the mixture in the beaker rapidly boiled, spilling over onto my hand burning it with first degree burns from the heat and chemcial burns from the acid and splashing all over the general area (I found holes in the tops of my shoes later). Fortunately I was following the standard rules of the lab and was wearing my lab apron and safety glasses. I ran to the sink and ran the water over my burned and dehydrated hands (sulfuric acid will suck the water out of your skin rather effectively). I can therefore attest personally to what happens when you try to mix acid and water quickly!

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13y ago

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