Is aluminum phosphate soluble in water? | Detailed Explanation

Aluminum phosphate, the chemical formula AlPO₄, a white crystalline powder, is an inorganic compound. It is insoluble in water, ethanol, and acetic acid, and soluble in concentrated hydrochloric acid, concentrated nitric acid, alkali, and alcohol. Is aluminum phosphate soluble in water? From the above introduction, we can see that it is not soluble in water. 

As for its application， aluminum phosphate is mainly used as chemical reagents and fluxes, which have good heat resistance, high strength, and high wear resistance. At 580 degrees Celsius, its chemical properties are stable. When the temperature is heated to 1400 degrees Celsius, it does not melt and becomes a colloidal body. Between room temperature and 1200 degrees Celsius, aluminum phosphate has four crystal forms.

The reaction of aluminum phosphate and water

Is aluminum phosphate soluble in water? The answer is No! Although aluminum phosphate is insoluble in water, they reacted. And if aluminum phosphate is mixed with water, some dangerous reactions will happen. We will give a detailed introduction to it below. The steps of the reaction between aluminum phosphate and water are as follows.

Step 1: Mix Aluminum phosphate with distilled water

First, put aluminum phosphate into the container, and then gradually add distilled water to it, and constantly stir until the aluminum phosphate is completely dissolved in the water. We should notice that water needs to be added slowly because aluminum phosphate is slightly soluble in water. That is to say, we can not pour the water at once in the process.

Step 2: Hydrogen is produced when water splits

Hydrogen gas can be produced when aluminum phosphate is dissolved in water and reacts, which is a violent chemical reaction that breaks out a lot of heat. If this process reacts too fast, it will produce a large amount of hydrogen and heat energy, and even cause an explosion. So it is necessary to keep calm in the process of mixing, and add water little by little and constantly without a break.

Step 3: Generate phosphoric acid and aluminum hydroxide

Eventually, aluminum phosphate and water react together to form phosphate and aluminum hydroxide. The hydrogen produced by this reaction can be vented. Aluminum hydroxide, the by-product, is a white powder that can be separated by filter paper or centrifuge for other reactions or treatments.

We want to say again that the reaction of aluminum phosphate with water is a violent chemical reaction that produces a large amount of hydrogen and heat. Therefore, it is necessary to add water slowly when mixing. In addition, in laboratories and industrial production, certain safety measures also need to be taken to ensure the safety of operations. It is helpful to understand chemical reactions and improve safety awareness in the laboratory and industrial production when we know well about the mechanism and steps of this reaction.

Uses of aluminum phosphate

Now we know the answer to this question “Is aluminum phosphate soluble in water”. Then we want to introduce its application. Aluminum phosphate is generally used as a bonding agent for acidic and neutral refractory materials such as silica, high aluminum, zirconium, and silicon carbide. However, it is usually not used for alkaline refractory materials, especially magnesium refractory materials because aluminum phosphate reacts violently with magnesia, and the mix coagulates rapidly. The binder with aluminum phosphate as a refractory has the following characteristics: non-toxic and tasteless, does not erode the skin, soluble in water or aqueous solution at room temperature, with very high viscosity.

The security of aluminum phosphate

We should store it in a warehouse with a ventilated, dry environment, sealed package and pay attention to moisture. Do not mix with acid, alkali and colored chemical raw materials. Handle with care during loading and unloading to prevent the packing from breaking or hurting. If a fire happens, we can stop it with water, sand and carbon dioxide fire extinguishers.

Conclusion: 

At the end of this article, we will conclude on the topic of “Is aluminum phosphate soluble in water”. Aluminum phosphate is insoluble in water, but this organic compound can react with water producing enormous heat and hydrogen gas, and even can explode. So no matter when we store it or do some experiment with it, we must be careful to avoid some dangers. And when some water is added to aluminum phosphate, we must add it slowly and little by little.