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<p>[QUOTE=&quot;Pavlos, post: 4591744, member: 96635&quot;]HF acid is indeed a weak acid hence the use of &quot;or&quot; in my sentence. Besides that it is in able to act as a strong acid at higher concentrations since the bifluoride ions can form an extremely strong hydrogen bond with water. It reacts easily with glass to silicon tetrafluoride and hexafluorosilicic acid and is used a lot in the industry to etch glass. And yes strong acids such as HCl, H2SO4 and HNO3, can react with glass as well, but slower than NaOH, hence the boiling to increase reaction speed.[/QUOTE]</p><p><br /></p>

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