Silicic Acid in phosphoric acid solution

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The concentration of the solution does not appear to be a limiting factor in the formation of this polymeric silica. In summary, the reaction described involves the precipitation of a gelatinous amorphous hydrated silica, composed of Si(OH) and SiO units, from a phosphoric acid solution. The concentration of the solution does not seem to affect the formation of this polymeric silica.
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JohnP
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Consider the following reaction:
3Si3N4 + 27H2O + 4H3PO4 --> 4(NH4)3PO4 + 9H2SiO3 --> ^4NH3(g) + 4H3PO4 + 9H2SiO3 --> 4H3PO4 + ??

The phosphoric acid solution is 85%wt.

In your fella's opinion, what happens to the Meta Silicic Acid (H2SiO3)? Is the solution to acidic to form a polysilicic acid?
Will this occur: H2SiO3 --> H2O + SiO2 and form a gelatinous poly silica? Something else?
I do know that at relatively low concentrations of this silicate based product (~100PPM @ 155C) the product will come out of solution.
Appreciate your thoughts, thanks guys.
 
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I would expect a gelatinous amorphous hydrated silica. It would be a polymer composed of Si(OH) and SiO units, not the stoichiometric dissociation that your equation suggests
 

Related to Silicic Acid in phosphoric acid solution

1. What is silicic acid in phosphoric acid solution?

Silicic acid is a type of acid that is formed when silicon dioxide (SiO2) is dissolved in water. When added to a solution of phosphoric acid (H3PO4), the resulting mixture is referred to as silicic acid in phosphoric acid solution.

2. What is the purpose of using silicic acid in phosphoric acid solution?

Silicic acid is commonly used as a dispersing agent or a surfactant in various industrial processes. In particular, it is often added to phosphoric acid solutions to prevent the formation of undesirable precipitates and to improve the stability and clarity of the solution.

3. Is silicic acid in phosphoric acid solution safe for human consumption?

Silicic acid in phosphoric acid solution is generally considered safe for human consumption in small amounts. However, it is important to note that large doses of silicic acid may cause digestive discomfort and prolonged exposure to high concentrations of silicic acid can potentially lead to adverse health effects.

4. How is silicic acid in phosphoric acid solution prepared?

Silicic acid in phosphoric acid solution is typically prepared by mixing a solution of phosphoric acid with silicon dioxide. The exact ratio of phosphoric acid to silicon dioxide may vary depending on the desired concentration and properties of the final solution.

5. What are some common uses of silicic acid in phosphoric acid solution?

Silicic acid in phosphoric acid solution has a wide range of industrial and commercial applications. It is commonly used in the production of fertilizers, detergents, and water treatment chemicals. It is also used in the food and beverage industry as an additive for preventing precipitation and improving product clarity.

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