This is an operation without any practical significance. Evaporate the water completely, and the result is still a mixture of potassium hydroxide and sodium chloride. Because the number of k+ ions and oh- ions is equal, and the number of na+ ions and cl- ions is equal. This mixture still has many properties of potassium hydroxide and sodium chloride in both solid and solution. It has nothing to do with whether new substances are generated. This is also a general physical process. If you want to recover potassium hydroxide and sodium chloride, or sodium hydroxide and potassium chloride from the solution, evaporation alone is generally not enough, according to the phase diagram of these four ions. Based on this diagram, the possible separation is carried out by comprehensively considering the mass ratio, concentration, temperature and other conditions of the substances between them. That is a very specialized knowledge that can be learned in some inorganic chemical engineering majors. For such a mixture whose composition and concentration are unknown, even if it is treated according to the phase diagram, there are many possible separation results (related to the composition of the original solution). One is that potassium hydroxide and sodium chloride crystallize at the same time (the two substances are not separated).

另一种是，可以分离成氢氧化钾和氯化钠（氯化钠先结晶出来）。这时，人们说这基本上还是一个物理过程（没有新物质生成）。再一种是，当组成满足一定条件时，确实可以得到氢氧化钠和氯化钾。这时，有新物质生成。那就应该承认这是一个化学过程，也可以写出相应的方程式。在这里，物质间溶解度的差别是驱动这个反应进行的动力。用硝酸钠与氯化钾反应制硝酸钾，写的方程式就是，NaNO3+KCl=KNO3+NaCl（结晶）。其中的“结晶”就相当于沉淀符号。

The other is that it can be separated into potassium hydroxide and sodium chloride (sodium chloride crystallizes first). At this time, people say that this is basically a physical process (no new material is generated). Another is that when the composition meets certain conditions, sodium hydroxide and potassium chloride can be obtained. At this time, new substances are formed. It should be admitted that this is a chemical process, and the corresponding equations can also be written. Here, the difference in solubility between substances is the driving force driving this reaction. Sodium nitrate reacts with potassium chloride to produce potassium nitrate. The equation written is nano3+kcl=kno3+nacl (crystallization). The "crystallization" is equivalent to the precipitation symbol.

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