What color does ammonium aluminum sulfate produce by high temperature flame melting with chromium tr

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The following reaction occurs when heated after mixing aluminium oxide (Al2O3) and sulfur (S): Al2O3 + 3S Al2S3 + 3O2 This is a chemical reaction in which aluminium oxide and sulfur react at high temperatures to form aluminum sulfide and oxygen. Aluminium sulfide is a yellow solid with a rotten egg flavor that can be used in the preparation of other sulfide compounds or as a catalyst.

Oxygen is a colorless, odorless and odorless gas, which is one of the gases necessary to sustain life. If the sulfur is replaced with sodium hydroxide (NaOH), the reaction equation is: 2Al2O3 + 6NaOH 2Na3alo3 + 3H2O, which is an acid-base reaction in which aluminum oxide and sodium hydroxide react at high temperature to form trisodium aluminic acid and water.

Trisodium aluminic acid is a colorless crystal with a high melting point and high stability, which can be used in the preparation of other aluminum compounds or as a component of glass. Water, on the other hand, is a liquid substance that is one of the essential substances for life.

Analyze it:1The reaction products of magnesium-aluminum alloy and dilute sulfuric acid are magnesium sulfate and aluminum sulfate.

2.Add excess sodium hydroxide, pay attention to the excess, sodium hydroxide will react with aluminum sulfate to form aluminum hydroxide, due to excess, sodium hydroxide will also react with aluminum hydroxide to form sodium metaaluminate, and sodium metaaluminate is soluble, that is to say, now the precipitation in the solution only leaves the magnesium hydroxide produced by the reaction of sodium hydroxide and magnesium sulfate.

3.The precipitate of magnesium hydroxide is filtered out and burned, which will produce magnesium oxide.

4.Magnesium oxide 10g, the relative molecular weight of magnesium oxide is 40, that is to say, the remaining product is magnesium oxide, because magnesium oxide and magnesium are one-to-one correspondence, so the original magnesium in the magnesium laughing potato aluminum vertical line gold is also.

The magnesium mass is 6g, that is, there is 6g of aluminum in 10g of magnesium-aluminum alloy

a The element with valency change in this reaction is S, and the S element of Al2SO4 changes from +6 valence to +4 valence of the brother chain, which is reduced, so A is wrong;

b．al2o3

The aluminum atom and the oxygen atom are combined by ionic bonds, and there is no covalent bond, so b is wrong;

c． al2

o3n（al2

o3=m(alom(al

102g/mol

Contains anions, made up of n=nna

That is, it contains an envy anion, so c is correct;

The calculation of the amount of the substance does not indicate the standard condition, so the SO2 gas is not L, so D is wrong

Therefore, Li C was chosen

c. In this reaction, the S element in Al2 (SO4)3 changes from +6 valence to +4 valence in SO2, which is reduced and A is wrong; Al2O3 is an ionic compound and contains only ionic bonds, B is wrong; n(al2 o3 )= =""mol, then the number of oxygen ions is mol 3 mol-1

c Correct; Since the standard condition is not stated, the volume of SO2 gas generated cannot be determined, d is wrong.