What are the Properties of Ammonium Metatungstate Hydrate?

Ammonium Metatungstate Hydrate (Ammonium Metatungstate) has a number of unique properties that are important for its application and handling. The following are the main properties of Ammonium Metatungstate Hydrate:

  1. Appearance and color:

o Ammonium metatungstate hydrate usually appears as a white or slightly yellow crystalline powder.

  1. Solubility:

o Ammonium metatungstate hydrate is soluble in water and in ethanol, but insoluble in benzene. Its solubility is affected by various factors such as temperature, pH, and type of solvent.

  1. pH:

o The aqueous solution of ammonium metatungstate hydrate is weakly acidic, and the pH value is generally between 3.0 and 4.5.

  1. Thermal stability:

o Ammonium metatungstate hydrate is unstable at high temperatures and will gradually lose its water of crystallization and may further decompose into tungsten oxide and other products. Its decomposition temperature is usually between 400-500°C, but the exact temperature may vary depending on the heating conditions, type of atmosphere, and purity of raw materials.

  1. Chemical reactivity:

o Ammonium metatungstate hydrate can react chemically with a variety of substances, such as reacting with acids to form corresponding tungstates, and reacting with bases to form tungsten hydroxide. These reactions can be used to prepare other tungsten compounds or to adjust their chemical properties.

  1. Safety information:

o Ammonium metatungstate hydrate is classified as a hazardous chemical and has a certain degree of toxicity. It is necessary to follow appropriate safety regulations during handling and storage, such as wearing protective gloves, glasses, etc., and keeping it well ventilated and avoiding sources of ignition.

  1. Other properties:

o Ammonium metatungstate hydrate also has a certain degree of hygroscopicity and caking, so it needs to pay attention to moisture-proof and anti-caking measures during storage and transportation.

In general, ammonium metatungstate hydrate has the properties of being easily soluble in water, weakly acidic, and easily decomposed at high temperature, etc. These properties determine its scope of application in industrial production and scientific research. At the same time, as it is a dangerous chemical, special attention to safety is needed in the process of handling and storage.

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