Sulfurous anhydride

Copper does not form protective oxide fdms. Therefore, its corrosion resistance is poor against most acids and salts. Many gases-haloids, sulfurous anhydride, sulfur vapors, hydrogen sulfide, carbon dioxide, ammonium-destroy copper. However, copper is highly corrosion resistant to alkali solutions. 

Schwefelaaure, /. sulfuric acid, -onhydrid, n. sulfuric anhydride, sulfur trioxide, -ballon,... 

L-Pyroglutamyl-L-glutaminyl-L-aspartyl-L-tyrosine azide L-Threonyl-glycyl-L-tryptophanyl-L-methionyl-L-aspartyl-L-phenylalaninamide Pyridine sulfuric anhydride Sodium carbonate... 

Potassium bromate Unknown s Sulfurous anhydride (gas) Unknown s... 

When the temperature is allowed to rise above 20°, the acetic-sulfuric anhydride mixture acquires a yellow to orange color from which discolored crystals are subsequently deposited. The addition, which must be slow at first, requires 1-1.5 hours depending on the efficiency of the cooling bath. 

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