Ammonium iodide

chemical

Ammonium iodide, chemical formula NH four I。 It is colorless crystal or particle under normal temperature. Soluble in water 、 acetic acid 、 ammonia , soluble in ethanol 、 acetone ； Slightly soluble in Ether 。 After heating ammonium iodide sublimation Its gas will appear free iodine in yellow or brown when exposed to light and air.

Chinese name: Ammonium iodide
Foreign name: Ammonium iodide

Molecular weight:: one hundred and forty-four point nine four two nine
Molecular formula:: NH four I

catalog

nature

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chemical property:

Ammonium iodide is sublimated after heating, and its gas will appear free iodine when exposed to light and air and become yellow or brown. Its aqueous solution is easily oxidized iodine 。

Decomposition reaction 2NH four I ═ 2NH three ↑ + H two ↑ + I two

It can be co heated with strong alkali to generate ammonia: NH four I＋NaOH → NaI＋NH three ↑＋H two O

2NH four I＋Ca(OH) two ＝CaI two ＋2NH three ＋2H two O

It can react with acid to generate another acid and another salt: NH four I＋H three PO four =Heating=NH four H two PO four ＋HI↑

It can react with salt to generate two new salts: NH four I＋AgNO three → AgI↓＋N two H four O three (NH four NO three )

Character: colorless (sometimes slightly yellowish) cubic crystal. Deliquescence and photosensitivity.

Solubility: soluble in water, acetic acid, ammonia, easily soluble in ethanol, acetone; Slightly soluble in ether.

purpose

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It is used in pharmaceutical industry and photographic industry.

Preparation or source

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Neutralization method: add iodine and red phosphorus into the reactor containing water, react under stirring, carefully filter the reaction solution, distill, collect 125~130 ℃ fractions, and obtain hydroiodic acid. When ammonia gas is introduced to neutralize all hydroiodic acid to pH 8~9, stop the introduction of ammonia gas. After the solution is filtered, it is evaporated in water bath vacuum until most of the crystallization is precipitated. After cooling, centrifugation and drying at 50~60 ℃, the finished product of ammonium iodide is prepared.

HI + NH four OH(NH three ·H two O) = NH four I + H two O

Storage and transportation

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Packed in brown glass bottles, each with a net weight of 0.5kg. External wooden cases are used for container transportation, with 10 bottles in each case. Packaging operations shall be carried out in a dark room or under red light. It shall be stored in a cool, dark and dry warehouse. The bottle mouth must be sealed. Rain and sunlight shall be prevented during transportation. Handle with care during loading and unloading, and do not hit or shake to prevent glass bottles from being damaged. In case of fire, water, sand and various fire extinguishers can be used.

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