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).

另一種是，可以分離成氫氧化鉀和氯化鈉（氯化鈉先結(jié)晶出來）。這時，人們說這基本上還是一個物理過程（沒有新物質(zhì)生成）。再一種是，當(dāng)組成滿足一定條件時，確實(shí)可以得到氫氧化鈉和氯化鉀。這時，有新物質(zhì)生成。那就應(yīng)該承認(rèn)這是一個化學(xué)過程，也可以寫出相應(yīng)的方程式。在這里，物質(zhì)間溶解度的差別是驅(qū)動這個反應(yīng)進(jìn)行的動力。用硝酸鈉與氯化鉀反應(yīng)制硝酸鉀，寫的方程式就是，NaNO3+KCl=KNO3+NaCl（結(jié)晶）。其中的“結(jié)晶”就相當(dāng)于沉淀符號。

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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