Making Ammonium Metavanadate | Summary and Q&A

October 27, 2016
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Making Ammonium Metavanadate


This video shows the synthesis of ammonium metavanadate, although it required excess water and ammonium chloride for successful crystallization.

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Key Insights

  • ⚾ Ammonium metavanadate is a vanadium-based compound used as an intermediate in vanadium purification and as a catalyst in chemical reactions.
  • ❓ Vanadium compounds, including ammonium metavanadate, are toxic and require proper handling and disposal.
  • ⏫ The synthesis of ammonium metavanadate involves the reaction of vanadium pentoxide with sodium carbonate, followed by a double displacement reaction with ammonium chloride.
  • 💦 Excess water is needed during the synthesis to dissolve the sodium metavanadate completely, and additional ammonium chloride is required for successful crystallization.


This is a quick warning, vanadium compounds are toxic, so it's important to be careful when working with them. This also means that waste from this experiment can't just be poured down the drain — and it must be placed in an appropriate waste container. Ammonium Metavanadate is a vanadium-based white, inorganic powder with the formula NH₄VO₃ It's t... Read More

Questions & Answers

Q: Why was it necessary to add excess water during the synthesis process for complete dissolution of sodium metavanadate?

The commonly listed solubility of sodium metavanadate may be incorrect, or other factors such as impurities or reaction conditions might have influenced the solubility. Further research is required for a conclusive answer.

Q: What could be the reason behind the need for a severe excess of ammonium chloride for successful crystallization, unlike in the reference video?

There might have been variations in the quality or purity of the reagents used, which affected the reaction kinetics and led to the need for more ammonium chloride. Other factors, such as temperature or the rate of addition, might also come into play.

Q: How does the yield of ammonium metavanadate obtained in this experiment compare to the theoretical yield?

The video does not provide information about the theoretical yield. However, the 80% yield obtained suggests that the experimental procedure was relatively successful despite the challenges faced.

Q: Are there alternative methods or modifications that can improve the crystallization process of ammonium metavanadate?

Further experimentation and research could explore different reaction conditions, such as temperature, pH, or the use of different catalysts, to potentially improve the efficiency and yield of the crystallization process.

Summary & Key Takeaways

  • The video demonstrates the synthesis of ammonium metavanadate using sodium carbonate, vanadium pentoxide, and ammonium chloride.

  • Excess water was required during the process to dissolve the sodium metavanadate completely, despite the commonly listed solubility.

  • An excess amount of ammonium chloride had to be added for successful crystallization, unlike in the reference video.

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