Problems with precipitation in ammonium molybdate solution? ? ?
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When preparing a 100 G/L ammonium molybdate solution, I dissolved all of the ammonium molybdate, but after using it for some time, precipitation formed at the bottom. It’s already the third time, and we still can’t find the cause. I don’t know why. I hope my colleagues can help me out. Thank you!
Hehehe, ammonium molybdate solution is not very stable; it decomposes and forms precipitates after being left for some time. It’s usually prepared in small quantities, and adding a little sodium carbonate can help stabilize it. Hehehe, it’s best to prepare it just before use
We can’t use it for extended periods; we use it to measure silicon in steel, and it also needs to be re-prepared frequently.
Yes, it’s naturally crystallized; what you mentioned falls into this category – it needs to be prepared and used right away
Of course, the more professional term is natural crystallization
Add some ammonia to it, and then there will be no problem
1. Prepare a solution with a higher concentration, and add a small amount of base to maintain stability. 2. Each time, take a small amount of this concentrated solution and dilute it to the desired concentration for use. That makes things much easier.
Ammonium molybdate, ascorbic acid – these solutions are prepared and used immediately
Come and learn a bit; I heard that adding some ammonia can help stabilize it :) :)
The solubility of ammonium heptamolybdate is very high; at room temperature it can reach 70 grams. However, the presence of other components has an impact, and impurities are likely to be present.
Is ammonium molybdate used for measuring phosphorus? Come and learn*、、