The video shows the effects of concentrated hydrochloric acid and sodium hydroxide concentrated on a leg of pork and the effect of hydrochloric acid on metals that are a clock.
strong acids react with metals such as iron in the stainless steel watch metal forming salts and releasing hydrogen gas (which is why bubbles are seen in the solution). The clock contains other metals in addition to iron, which are responsible for the color of the solution.
matter of living beings, is basically formed by proteins, which when attacked by acid, denatured, ie they produce changes in protein structure that alter their functions. The enzyme activity takes place in an uncoordinated manner and chaotic. The high concentration of acid cleaves peptide bonds between amino acids that form proteins, destroying them. Bones are made of calcium carbonate and proteins, carbonates in the presence of strong acids are transformed into carbon dioxide and water. At the end of the process, leaving only the fat which is floating in the solution.
Strong bases have a much less dramatic reaction, but the degree of destruction is visible. Caustic soda, first neutralizes the acid protective layer of the skin and forms a soap with the fat layer, a layer that can protect the leg of pork destructive advance of the base. A few proteins are also hydrolyzed by base.
Attack of the base is not as strong as the acid, however, a few drops of a concentrated solution of sodium hydroxide in the retina can lead to blindness.
The video is not exactly pleasant, but it may be instructive on the dangers of these substances. It's the page: http://www.science-tube.com that contains a lot of interesting experiments.
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