FeOOH Basic Iron Oxide Iron Oxide Iron Hydroxide How to know if it contains crystalline water

The general formula of hydroxyl iron oxide (also known as basic iron oxide) is feox· (OH)3-2X,[1] This is a substance of variable composition.

Hydroxyl iron oxide can be converted into iron oxide under certain conditions.

Hydroxyl iron oxide can be used in the desulfurization process in industry, the removal effect is better, it can replace ZNO in certain circumstances, its cost is lower than that of ZNO, and the desulfurization effect is better.

The manufacturing method of hydroxyl iron oxide particles, which is characterized in that the method comprises:

Process A, the ferrous brine aqueous solution and the alkaline aqueous solution containing 1 or 2 kinds selected from carbonate alkali and hydroxide alkali are mixed to obtain a suspension containing ferrous iron;

process b, the suspension obtained in the process a is controlled in the temperature range of more than 5 but less than 10, and the oxygen-containing gas with an oxygen component ratio of 0 5 0 8 is blown into the suspension solution, so that the ferrous iron in the suspension is oxidized at an oxidation rate of 30 65%, and the hydroxyl iron oxide particle precursor is obtained;

process c, after described process b, the suspension containing the precursor of the hydroxyl iron oxide particle is controlled in the temperature range of more than 20 but less than 45, and the oxygen-containing gas is blown into the suspension, so that the hydroxyl iron oxide particle is generated by the hydroxyl iron oxide particle precursor.

Crystalline water is the water molecules that are bound in a chemical compound, and they are not liquid water. Many crystals contain crystal water, but not all crystals contain crystal water. When the solute crystallizes and precipitates from the solution, a certain number of water molecules are bound to the crystal, and such water molecules are called crystal water.

Whereas, basic iron oxide does not contain crystalline water. Otherwise, the molecular formula is written as . For example, there are 5 crystals of bile alum CU (SO4) · 5H2O.

This method cannot be used because this substance will still decompose water when heated even in the absence of crystalline water.

Weigh M g solids, add excess hydrochloric acid to dissolve, and then measure the concentration of Fe3+ in C mol liters. Then the molar mass m = (m c) gram mol, if m is significantly greater than 89, then there is crystal water; If it is very close to 89, it can be roughly assumed that there is no crystal water.

Seeking crystal water is high 3 to learn me. The abbreviation [four calls and two heat] means that the quality of the beaker is first weighed. Data 1

Then weigh the mass of the beaker + feooh (containing crystalline water). Data 2 then heats the above substances, cools them in a dryer and weighs them.

Until the difference in the mass that cools after two heating is less than the mass of the last weighing. Data 3 will be (Data 3 - Data 1) (Data 2 - Data 3) = feooh crystal water.

<>1. Iron hydroxide Qiaoling is a precipitation.

2. The chemical properties of hydroxide filial piety iron are as follows: it is amphoteric but its alkalinity is stronger than acidity, and hydrated iron oxide is easily soluble in inorganic acids and organic acids, and can also be soluble in hot concentrated alkali. With a strong oxidizing agent (such as sodium hypochlorite), in an alkaline medium, iron hydroxide can be oxidized to a +6 oxidation state of ferric acid wild sodium (Na2FeO4).

When heated, it gradually decomposes into iron oxide and water. Insoluble in water, ether, acid and ethanol. Iron hydroxide can be used to make pigments, medicines, and can also be used as an antidote to arsenic.

1. Iron hydroxide.

It's precipitation. 2. The chemical properties of iron hydroxide are as follows: it has amphoteric but its alkalinity is stronger than acidity, and hydrated iron oxide is easily soluble in inorganic acids and organic acids, and can also be soluble in hot concentrated alkali. Has a strong oxidizing agent (e.g., sodium hypochlorite.

In alkaline media, iron hydroxide can be oxidized to sodium ferrite (Na2FeO4) in a +6 oxidation state. When heated, it gradually decomposes into iron oxide and water. Insoluble in water, ether, acid and ethanol.

Iron hydroxide can be used to make pigments and medicines, and can also be used to prepare antidotes for arsenic and so on.

(2) According to the anhydrous copper sulfate white powder turns blue when exposed to water, sulfur dioxide can fade the potassium permanganate solution, which can be denied as conjecture 2;

According to the law of conservation of mass, the number of types of element atoms before and after the chemical reaction remains unchanged, because the ratio of the remaining S and O atoms after the decomposition of every two FeSo4 to generate 1 Fe2O3 is 2:5 and not equal to 1:2, so it can be obtained through theoretical analysis

The decomposition of green alum also generates another substance, SO3, so the answer is: after every two FeSo4 decomposes to form 1 Fe2O3, the ratio of the remaining S and O atoms is 2:5 and not equal to 1:

2；Because sulfur trioxide is dissolved in water and reacts with water to form acid, sulfur dioxide can also react with water to form sulfurous acid, so Xiaohong believes that Xiao Ming cannot achieve the purpose of the experiment, and the reason for this judgment is that SO2 can be dissolved in water to form sulfurous acid, and sulfurous acid can make purple litmus red;

According to the test of sulfate ions, the substance in the bottle should be barium chloride solution, 3) the function of the BA12 solution in the dotted box device is to check whether there is SO3 gas in the decomposition product, if it contains this gas, it will generate barium sulfate white precipitate, and the observed observation is that the solution becomes turbid; Then sodium carbonate was added to D to produce bubbles, which proved that the reaction produced SO3; According to the law of conservation of mass, the reactant and the conditions for the formation reaction can be written as the equation: 2FeSO4

High temperaturesHigh temperatures

fe2o3+so2↑+so3↑．

(2) According to the anhydrous copper sulfate white powder turns blue when exposed to water, sulfur dioxide can fade the potassium permanganate solution, which can be denied as conjecture 2;

According to the law of conservation of mass, the number of types of element atoms before and after the chemical reaction remains unchanged, because the ratio of the remaining S and O atoms after the decomposition of every two FeSo4 to generate 1 Fe2O3 is 2:5 and not equal to 1:2, so it can be obtained through theoretical analysis

The decomposition of green alum also generates another substance, SO3, so the answer is: after every two FeSo4 decomposes to form 1 Fe2O3, the ratio of the remaining S and O atoms is 2:5 and not equal to 1:

2；Because sulfur trioxide is dissolved in water and reacts with water to form acid, sulfur dioxide can also react with water to form sulfurous acid, so Xiaohong believes that Xiao Ming cannot achieve the purpose of the experiment, and the reason for this judgment is that SO2 can be dissolved in water to form sulfurous acid, and sulfurous acid can make purple litmus red;

According to the test of sulfate ions, the substance in the bottle should be barium chloride solution, 3) the function of the BA12 solution in the dotted box device is to check whether there is SO3 gas in the decomposition product, if it contains this gas, it will generate barium sulfate white precipitate, and the observed observation is that the solution becomes turbid; Then sodium carbonate was added to D to produce bubbles, which proved that the reaction produced SO3; According to the law of conservation of mass, the reactant and the conditions for the formation reaction can be written as the equation: 2FeSO4

High temperaturesHigh temperatures

fe2 o3 +so2 ↑+so3 ↑．

There are two types of hydroxides in Fe, which are reddish-brown Fe(OH)3 and white Fe(OH)2

Iron hydroxide and ferrous hydroxide are insoluble in water; Fe(OH)2 is white, it is easy to be oxidized in the air, the reaction phenomenon is: first turn gray-green, and finally turn reddish-brown, and the sub-equation of the reaction is: 4Fe(OH)2O22H2

o═4fe（oh）3

Iron hydroxide can react with hydrochloric acid to form iron chloride to quietly balance and water, and the solution turns brownish-yellow, and the ionic equation of the reaction is: Fe(OH)3

3h+fe3+

3h2o；Iron powder is added to the ferric chloride solution, and the iron ions can react with the iron powder to form ferrous ions, and the solution turns light green, and the ion equation of the reaction is: 2Fe3+

fe═3fe2+

So the answer is: Fe(OH)3

fe（oh）2

No; fe（oh）2

4fe（oh）2o22h2

o═4fe（oh）3

Celadon; Sorrel; Yun's brownish-yellow; fe（oh）33h+fe3+

3h2o；light green; 2fe3+

fe═3fe2+

The precipitate is a solid substance, which can be filtered, the ferric hydroxide colloidal has the Tyndall phenomenon, and the complexed iron is the solution.

The sediment is at the bottom of the container, the colloid is the solution, the colloid is a color, and the color of the precipitate has shades.

1. Iron hydroxide is a precipitate.

2. The chemical properties of iron hydroxide are as follows: it has amphoteric but its alkalinity is stronger than acidity, and hydrated iron oxide is soluble in inorganic acids and organic acids, and can also be soluble in hot concentrated alkali. With a strong oxidizing agent (such as sodium hypochlorite) in an alkaline medium, it can oxidize iron hydroxide to sodium ferrite (Na2FeO4) in a +6 oxidation state.

When heated, it gradually decomposes into iron oxide and water. Insoluble in water, ether, acid and ethanol. Iron hydroxide can be used to make pigments, medicines, and can also be used as an antidote to arsenic, etc.