Why HF attack glass while HCl do not?
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Acids do not burn or corrode everything that they come in contact with. Even hot, concentrated sulphuric acid does not attack glass. Among acids, only hydrofluoric acid (HF) is known to attack glass, as it reacts with silica present in glass to form hydrofluorosilicic acid.
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Hydrofluoric acid, on the other hand, is a weak acid, not completely ionized into H+ and F- ions. ... However, glass is readily attacked by HF, but not by HCl. The process appears to involve HF molecules (not protons) that disrupt silicon-oxygen bonds in the glass.
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