How to identify potassium sulfate?

How to identify potassium sulfate? Please introduce the identification method potassium sulfate identification method can refer to the following: first, look at the appearance. Potassium sulfate is in the shape of crystals. Second, look at the color. Potassium sulfate is generally white, and some are grayish yellow\ grayish green or light brown. Third, observe the hygroscopicity. Potassium sulfate is basically not hygroscopic, and even if the humidity of the air exceeds 70%, potassium sulfate still retains its original shape (this is the main distinction between potassium chloride and potassium sulfate). Fourth, observe the dissolution of water. The solubility of potassium sulfate was observed by using the method introduced in the urea section. Potassium sulfate can dissolve, but the rate of dissolution is slower than that of potassium chloride, and the amount of dissolution is smaller than that of potassium chloride (this is one of the divisions of potassium chloride and potassium sulfate). Fifth, the color of the flame. By using the method introduced in the potassium chloride section, the flame color of potassium sulfate was observed, and it was found that potassium sulfate had a purple flame peculiar to potassium ion during burning. Measure the pH of the solution. When the pH extensive test paper is inserted into the aqueous solution of (4), the superior and first-class potassium sulfate solution is acidic, and the strip color is red; the qualified potassium sulfate solution is alkaline, and the strip color is blue (this is one of the methods to distinguish potassium chloride from potassium sulfate). Click to get more nitrogen, phosphorus, potassium application techniques click to get more chemical fertilizer application techniques