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Barium iodide

White crystal chemicals

This entry is made by Compilation and application of scientific encyclopedia entries of "Science Popularization China" to examine.

Barium Iodide Anhydrous two There are two types of inorganic compounds, one is hydrate, the other is anhydrous. Soluble in acetone, slightly soluble in alcohol. Its aqueous solution is neutral or slightly alkaline. When heated to 98.9 ℃, one crystal water will be lost; when heated to 539 ℃, two crystal water will be lost; when heated to 740 ℃, it will decompose. Easily deliquescent. In the air, due to the release of iodine, it quickly turns red. Barium iodide is used to make other iodides.

Chinese name: Barium iodide
Foreign name: Barium Iodide Anhydrous
chemical formula: BaI2
CAS login number: 13718-50-8

EINECS login number: 237-276-9
Application: Manufacture of other iodides
Hazard symbol: R20/22
Dangerous goods transportation number: UN 1564 6.1/PG 3
molecular weight: three hundred and ninety-one point one three five nine

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Composition

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Barium iodide is colorless rhombic crystal or white granular crystal. Easily soluble in water. Soluble in acetone, slightly soluble in alcohol. Its aqueous solution is neutral or slightly alkaline. When heated to 98.9 ℃, one crystal water will be lost; when heated to 539 ℃, two crystal water will be lost; when heated to 740 ℃, it will decompose. Easily deliquescent. In the air, due to the release of iodine, it quickly turns red. Barium iodide is used to make other iodides^[1] 。

Molecular structure data

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1、 Molar refractive index : No available

2. Molar volume (cm three /Mol): None available

3. Isotonic specific volume (90.2K): none available

4. Surface tension (dyne/cm): none available

5. Dielectric constant: None available

6. Polarization (10-24cm three ）: No available

7. Single isotope mass: 391.714162 Da

8. Nominal mass: 392 Da

9. Average mass: 391.1359 Da

Calculate chemical data

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1. Number of hydrogen bond donors: 0

2. Number of hydrogen bond receptors: 2

3. Number of rotatable chemical bonds: 0

4. Topological molecule polar surface area (TPSA): 0

5. Number of heavy atoms: 3

6. Surface charge: 0

7. Complexity: 2.8

8、 Isotope atom Quantity: 0

9. Determine the number of atomic structure centers: 0

10. Number of uncertain atomic structure centers: 0

11. Determine the number of chemical bond structure centers: 0

12. Number of uncertain chemical bond structure centers: 0

13. Number of covalent bond units: 3

Preparation method

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1. A production method of barium iodide dihydrate, which is characterized in that it comprises the following steps in turn:

(1) Ferrous iodide Synthesis steps: add iodine and iron powder in the molar ratio of iodine: iron powder=1.0 ∶ 1.2-1.5 into the container with water, where the weight of water in the container is 2-3 times the weight of iodine, react for 30-50 minutes at 40-60 ℃ and stirring speed of 60-100 rpm, and determine free iodine and IO 3- Prepare ferrous iodide solution after it is qualified;

(2) Synthesis steps of barium iodide: Ferrous iodide Solution according to ferrous iodide: Barium hydroxide =Add barium hydroxide solution to ferrous iodide solution under stirring condition in a molar ratio of 1 ∶ 1 for neutralization reaction to generate Fe (OH) two Sedimentation and BaI two Solution, boil the reaction solution for 20 minutes, and adjust the PH value to 8.5-9 with barium hydroxide;

(3) Filtration, concentration crystallization and drying steps: add activated carbon to the reaction solution according to 2-5% of the weight of iodine added, and adsorb and remove Fe (OH) two Precipitate, organic impurities and mechanical impurities to obtain transparent barium iodide solution, and then evaporate the barium iodide solution under normal temperature and pressure until barium iodide crystallizes, and then centrifuge the crystal barium iodide and dry it at 75-90 ℃ for 60-90 minutes to obtain BaI with the main content of barium iodide ≥ 99% 2˙ 2H two O。

2. Anhydrous barium iodide can be prepared with barium hydride and ammonium iodide in pyridine solution. After most pyridine is removed by distillation, the crystalline pyridine is removed by vacuum distillation at 150~160 ℃, with a yield of 97%^[2] 。

purpose

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Prepare other iodides.

Storage method

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Closed at room temperature, cool, ventilated and dry

toxicology data

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Acute toxicity: main irritant effects:

On the skin: Irritating the skin and mucous membrane;

Above the eyes: irritating effect; No known sensitization effects.

Ecological data

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Generally, it is slightly harmful to water bodies. Do not contact undiluted or large quantities of products with groundwater, waterways or sewage systems. Do not discharge materials into the surrounding environment without government permission.

Personal protective equipment

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Respiratory system protection: wear when the concentration in the air exceeds the standard Filter gas mask (Half mask). When rescuing or evacuating in an emergency, a portable respirator should be worn.

Hand protection: wear rubber oil resistant gloves.

Eye protection: wear chemical safety protection eyes.

Skin and body protection: wear work clothes to prevent poison penetration.

First aid measures

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First aid:

Inhalation: If inhaled, move the patient to fresh air.
Skin contact: Take off the contaminated clothes and wash the skin thoroughly with soapy water and clean water. If you feel unwell, seek medical advice.
Eye contact: separate the eyelids and wash them with flowing water or normal saline. Get medical attention immediately.
Ingestion: Rinse mouth, do not induce vomiting. Get medical attention immediately.

Advice for protecting rescuers:

Move the patient to a safe place. Consult a doctor. Show this chemical safety data sheet to the doctor on site.

Special tips for doctors:

No data available.

Leakage emergency treatment

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Protective measures, protective equipment and emergency response procedures for operators:

It is recommended that emergency treatment personnel wear gas breathing apparatus, anti-static clothing and rubber oil resistant gloves.
Do not touch or cross the leakage.
All equipment used in operation shall be grounded.
Cut off the leakage source as much as possible.
Eliminate all ignition sources.
The warning area shall be demarcated according to the influence area of liquid flow, steam or dust diffusion, and irrelevant personnel shall evacuate from crosswind and upwind to the safety area.

Environmental protection measures:

Collect leakage to avoid environmental pollution. Prevent leakage into sewers, surface water and groundwater.

Methods of receiving and removing leaked chemicals and disposal materials used:

Small amount of leakage: collect the leaked liquid in a sealable container as far as possible. Absorb with sand, activated carbon or other inert materials and transfer to a safe place. Do not flush into the sewer.
Large amount of leakage: build a dike or dig a pit to receive. Close the drainage pipe. Cover with foam to inhibit evaporation. Transfer to tank car or special collector with explosion-proof pump, recycle or transport to waste disposal site for disposal^[3] 。

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