Non-oxidizing acids

As previously stated, polyurethanes do not have the degree of chemical resistance enjoyed by the other elastomers. Specially designed chemical resistant polyurethanes are suitable for use in dilute non-oxidative acids and salts, but are not normally suitable for alkalis. They show good resistance to oils and solvents. Maximum temperature of use is usually about 80°C, but this temperature is very dependent on the chemical environment. 

Unlikely to be compatible - USCG chart NVC 4-75 indicates a hazard with non-oxidizing acids plus sulfuric acid. Heat of mixing may be significant. 

Synthesis in liquidAl Al as a reactive solvent Several intermetallic alu-minides have been prepared from liquid aluminium very often the separation of the compounds may be achieved through the dissolution of Al which dissolves readily in several non-oxidizing acids (for instance HC1). For a review on the reactions carried out in liquid aluminium and on several compounds prepared, see Kanatzidis et al. (2005) binary compounds are listed (Re-Al, Co-Al, Ir-Al) as well as ternary phases (lanthanide and actinide-transition metal aluminides). Examples of quaternary compounds (alumino-silicides, alumino-germanides of lanthanides and transition metals) have also been described. As an example, a few preparative details of specific compounds are reported in the following. 

C. The element Co is a hard lustrous bluish-white metal which acquires a somewhat inert coat of C03O4 in air or aerated HOH. It is not further reactive with HOH, air, or bases, but dissolves slowly in non-oxidizing acids and rapidly in dilute oxidizing acids to give pink Co+. When finely powdered, Co heated in air gives black C03O4. 

In contrast to pyridine derivatives, aryl- and alkyl-substituted A -phosphorins cannot be protonated by strong, non-oxidizing acids such as trifluoroacetic acid. Addition of trifluoroacetic acid to cyclohexane solutions of various A -phosphorins fails to produce any change in the UV spectra Similarly, alkylation by such strong agents as oxonium salts or acylation by acylchlorides cannot be induced at the P atom or any ring C atom. This behavior has also been discussed theoretically 55a)... 

The name tungsten bronzes originates from their characteristic properties intense color, metallic luster, metallic conductivity or semiconductivity, a range of variable composition, and resistance to attack by non-oxidizing acids. The bronzes Na W03 exhibit colors that change with the occupancy factor x as follows ... 

Mercury, like copper, will not dissolve in non-oxidizing acids, but it does dissolve in nitric acid. Two oxides of mercury are known, Hg20 and HgO, corresponding to the mercurous and mercuric salts. In order to obtain the nitrate corresponding to the lower oxide, it is necessary merely to keep mercury present in excess until after the acid is exhausted. 

While mercury is inert to non-oxidizing acids and bases, both zinc and cadmium readily dissolve in simple acids to give the M2 ions. Zinc will dissolve in concentrated bases to form zincate ions ... 

Manganese is roughly similar to Fe in its physical and chemical properties, the chief difference being that it is harder and more brittle but less refractory (mp 1247°C). It is quite electropositive and readily dissolves in dilute, non-oxidizing acids, e.g., trifluoroacetic acid gives Mn(CF3C02)2.1... 

Example 2.10 Is the reaction between metallic Fe and a 1 M solution of a strong (non-oxidizing) acid to produce Fe2+ ions thermodynamically spontaneous ... 

In the presence of a strong, non-oxidizing acid, trifluoroacetic acid, the cyclisation at carboranyl edge (Scheme 3.) is less effective compared to Pd catalyst in the carbenoid reaction. 

DOT NA 2809 af Hg aw 200.59 PROP Silvery, heavy, mobile liquid at room temp, freezing to a white soUd. Solid tin-white, ductile, malleable mass that can be cut with a knife. A liquid metallic element. Colorless vapor. When heated, reacts with O2 (historically important reaction), S, halogens. Reacts with cone HNO3, but not with dil non-oxidizing acids Mp —38.89°, bp 356.9°, d 13.534 25°, vap press 2 x 10"3 mm 25°. IDLH 10 mg/m (as H. ... 

Sulfur Mortars Hot melt-and-pour sulfur mortars are ancient, doubtless one of the oldest of all chemical resistant materials still used today. They are very resistant to non-oxidizing acids and weak alkalies below 200°F over a pH range of 0-12. Three types of sulfur mortars are typically employed (1) One containing an all-silica filler with minimum plasticizer, used to bond acid brick (2) A mortar with an all-carbon filler and minimum plasticizer, used primarily to lay carbon brick for nitric-hydrofluoric acid pickling tanks (to clean stainless steels) and the underlying floors and (3) A much more flexible all-silica filled product with double the amount of plasticizer of the other two mortars, used to join vitrified clay (terra cotta) pipe conveying waste acids and other effluent chemicals, and to assemble "pole line hardware" for the power industry. 

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