safety-in-academic-chemistry-laboratories-students

Before you use or handle this acid be sure you are

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Unformatted text preview: he details are described in the MSDS for hydrofluoric acid. Before you use or handle this acid, be sure you are thoroughly familiar with the information provided in a currently valid MSDS for this acid. Your instructor should know the name of the hospital emergency room or the physician prepared in advance to treat hydrofluoric acid burns. Concentrated sulfuric acid is a very strong dehydrating agent. All except very dilute solutions are oxidizing agents. Sulfuric acid is also available as fuming sulfuric acid (oleum). In this form, which contains “extra” SO3, it is a strong oxidizing agent. When preparing aqueous solutions, always slowly add the acid to water while stirring the mixture. Remember that the heat of the solution will greatly increase the temperature— sometimes enough to cause it to boil and splatter. Nitric acid is also a strong oxidizing agent. It generally reacts more rapidly than sulfuric acid. If dilute nitric acid gets on the skin and is not washed off completely, it causes the exposed skin to become yellowish brown as a protein denaturing reaction occurs. Phosphoric acid is a weak acid. The concentrated acid is a viscous liquid and, like sulfuric acid, is a strong dehydrating agent. When preparing aqueous solutions, always add the acid to water slowly while stirring the mixture. Unlike most acids, which have a sour taste, dilute solutions of phosphoric acid taste sweet. In fact, dilute phosphoric acid is used as a sweetening agent in almost all soft drinks. Do not taste or swallow the phosphoric acid that is available in the laboratory. Perchloric acid is a very powerful oxidizing agent, particularly at elevated temperatures. It can react explosively with organic compounds and other reducing agents. Perchloric acid must be used only in a specially constructed water-wash-down laboratory hood that has been designated to be used only for this purpose. Do not use this hood until you have been instructed in the operation of the wash-down facility. Never work with perchloric ac...
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This document was uploaded on 02/27/2014 for the course PHYS 1B at UCSD.

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