A method for preparing 2,4-diaminobenzenesulfonic acid includes reacting o-phenylenediamine with sulfuric acid or fuming sulfuric acid in a solvent at a temperature range of 140-250°C to obtain 2,4-diaminobenzenesulfonic acid. The solvent used can be an inorganic solvent selected from phosphoric...
Ceresins react vigorously with fuming sulfuric acid, while normal paraffins react weakly with it. During the distillation of oil, ceresins are concentrated in the sediment, and normal paraffin is distilled with distillate. Ceresins, which are concentrated in the residue after the distillation of fue...
2-indiol (1.0g) in acetonitrile (20ml) cooled to -40°C, and add fuming sulfuric acid (21% SO3, 0.8ml). Mature the mixture for 1 hour, gradually heat it to 0°C, and add water. Heat the mixture to 80°C for 1 hour, obtaining an aqueous solution of (1R,2S)-1-amino-2-inda...
The exfoliation of flake graphite is performed in the tricomponent system made by a combination ofammonium persulfate ((NH4)2S2O8), concentrated sulfuric acid, and fuming sulfuric acid, acquiring a ∼100% yield of graphene nanosheets in 4 h at room temperature. What is exfoliation method? Exfo...
What is hydrogen fluoride? Hydrogen fluoride is a chemical compound that contains fluorine. It can exist as a colorless gas or as a fuming liquid, or it can be dissolved in water. When hydrogen fluoride is dissolved in water, it may be called hydrofluoric acid. Hydrogen fluoride can be rele...
Take some microchips of interest and add concentrated sulfuric acid. Container should be closed, but not airtight, so that fumes can escape (that is extremely important). Heat it to boiling temperature (300 °C). White substance at the bottom is baking soda - it's here to neutralize acciden...
what is the difference between the hot dip galvanize and galvanized sheet? By anon52797 — On Nov 17, 2009 We are pipe galvanizers. After galvanizing we directly dip the pipe in a solution of sodium dicromate+ 0.1 percent sulfuric acid. After the pipe is taken out from the passivation ...
what is the difference between the hot dip galvanize and galvanized sheet? By anon52797 — On Nov 17, 2009 We are pipe galvanizers. After galvanizing we directly dip the pipe in a solution of sodium dicromate+ 0.1 percent sulfuric acid. After the pipe is taken out from the passivation ...
what is the difference between the hot dip galvanize and galvanized sheet? By anon52797 — On Nov 17, 2009 We are pipe galvanizers. After galvanizing we directly dip the pipe in a solution of sodium dicromate+ 0.1 percent sulfuric acid. After the pipe is taken out from the passivation ...
2. Add 100mL concentrated nitric acid and 10mL fuming sulfuric acid into a 200mL three-necked flask. When the ice bath reaches 0℃, add 50g (2) under stirring. After the addition is completed, keep it at 0℃ for 1 hour. Then slowly add the reactant to 500 mL of ice water, and ...