Appearance: White powder or block. The relative density is 2.534. The melting point is 1109°C. It is soluble in water but insoluble in ethanol. The aqueous solution is alkaline. The solubility in 100 g of water at 25°C is 187 g. The pH of 1% aqueous solution is 10.2. Potassium pyrophosphate has all the properties of other condensed phosphates.

Storage conditions        

1. It should be stored in a ventilated and dry warehouse.

2. Can not be stored and transported together with acid products. Protect from rain, scorching sun, and moisture.

Stability

1. If used and stored in accordance with specifications, it will not decompose.

2. Dissolve 187g in 100g water at 25℃, which can chelate with alkaline earth metal and heavy metal ions. It is soluble in water but insoluble in ethanol. The aqueous solution is alkaline. The solubility in 100g of water at 25°C is 187g. The pH of a 1% aqueous solution is 10.2. Potassium pyrophosphate has all the properties of other condensed phosphates.

3. Both hygroscopicity and deliquescent are great. The solubility in 100g water is 187g (25°C). Insoluble in ethanol. The pH of a 1% aqueous solution is 10.2. There are two variants of α type (high temperature type) and β type (low temperature type). The β form is converted to the α form at 500°C. It is difficult to decompose pure aqueous solution when it is boiled, but it can be hydrolyzed when there are other acids or alkalis.