Ask a chemist, a reddish brown or dark brown liquid? Can be dyed, heated and discolored

Fe2(SO4)3, ferric sulfate solution is generated, because of stirring, the original H2SO4 reacts with Fe to form divalent iron, that is, FeSO4 solution, FeSO4 solution is green, Fe2(SO4)3, and iron sulfate solution is reddish-brown. 100,000g of iron is all dissolved, a simple calculation. Put the stone in the liquid, the stone CaCO3 content is large, and the trivalent Fe generates Fe2 (CO3) 3, 300-400 degrees drying, Fe2 (CO3) 3 decomposition, Fe2O3 The third question should be that after the original solution is diluted, the Fe2 (CO3) 3 attached to the stone is thin, and the temperature of 200-300 degrees is dried (lower temperature), and the decomposition is not complete, so it is golden yellow.

1. What is the name of this liquid? What is the concentration of this liquid?

This liquid is supposed to be ferrous sulfate, containing a small amount of iron sulfate, and you don't know the quality of sulfuric acid, and the concentration can't be calculated.

2. Put the stone in this liquid, soak it for 2 hours, and then take it out and turn the stone brown or dark brown. Put the stone in the drying room and dry it at 300-400 degrees for 2 hours, take out the stone and turn it red?? Why?

What kind of stone are you and what are the ingredients? The red color is iron hydroxide, which decomposes into iron oxide after heating, and is red.

3。Add 500 kg of water to this liquid, the color of the liquid becomes lighter, soak the stone in it for 2 hours, then take it out, and then dry it at a temperature of 200-300 degrees Celsius for 2 hours. The stone turns golden yellow??? Why?

The golden yellow color is also related to iron, and eighty percent of it is trivalent iron ions.

Bromine water. Liquid bromine is dark reddish-brown.

Solution containing permanganate purplish-red.

Iron hydroxide solution reddish-brown.

Ferric thiocyanide (Fe(scn)2+) (Blood-teased red)Ccl4 solution of I2 suspects nucleus (purplish-red).

Fe2(SO4)3, iron sulfate is generated.

Solution. Because of stirring, H2SO4 reacts with Fe to form.

Bivalent iron. That is, the FeSo4 solution is green, the FeSo4 solution is green, the Fe2(SO4)3, and the iron sulfate solution is reddish-brown. 100,000g of iron is all dissolved, a simple calculation. Put the stone on it.

Liquid. , stone caco3

Content. Large, with trivalent Fe to generate Fe2 (CO3) 3, 300-400 degrees drying, Fe2 (CO3) 3 decompose, Fe2O3

The third question should be that the original solution is diluted and slippery, Fe2 (CO3)3 attached to the stone is thin, and the temperature of 200-300 degrees is dry (lower temperature), and the decomposition is incomplete, so it is.

Golden.