In the restless laboratory, an experiment is being carried out intensely.

In front of the alcohol lamp, Li Qing and Song Qiu, one old and one young, each wore an exaggerated face shield, two pairs of eyes, staring at the distillation flask in front of them without blinking.

After discovering that Li Qing's mastery of theoretical knowledge was beyond the ordinary, Song Qiu immediately made a decision, put down the book, took Li Qing to Wuningju, and began to get started.

This is the second experiment done by Li Qing, and the same as the previous one, the content of the experiment is to separate the two essentia from the mixed dilution of the two essentia by distillation, the principle is that the boiling point of the two essentia is different, when heated, the black and white essentia with the lowest boiling point will first become vapor volatilization, so as to realize the separation of the two essentia.

The essence of this experiment is actually to purify the essentia, but in order to make the experimental results easier to observe, and to make it easier for Li Qing to understand the principle and operation process, Song Qiu chose two essentia as experimental materials, and used the other essentia to act as the impurities in the black and white essentia.

Before lighting the alcohol lamp, Li Qing had already added 1 drop of snake orchid grass liquid, 1 milligram of edible salt, 2 grams of silver powder, 5 drops of neem sap mixture, and 1 milligram of inferior jade powder to the large flask according to Song Qiu's instructions.

The first few items are necessary for the preparation of the solution used in distillation, except for the neem sap mixture, which is irreplaceable, the rest of the items can be found in the upper or lower substitutes, fully stirred, in order to make the solution more fully mixed, and the addition of broken porcelain pieces is for safety considerations to prevent boiling.

These things were placed on the test bench early, and it can be seen that Song Qiu has made sufficient preparations for this lecture, and his intentions can not be described as bad.

In view of the previous failure experience, this time Li Qing not only controlled the quantity more accurately, but also made corresponding improvements to the operation steps, and also found a face shield to prevent the flask from exploding and scratching people's faces from happening again.

The device used in the experiment is exactly the same as that used to make distilled water, but compared with the water that benefits all things, the nature of essentia is undoubtedly much more lively and complex.

Gollum!

The mixed solution in the flask was boiled, forming angular quadrangular bubbles, the color of the solution began to lighten, and wisps of black and white essentia vapor began to appear.

Li Qing stretched out his hand, turned the grid on the alcohol lamp to adjust the size of the flame a little smaller, and carefully moved the position of the flask down slightly a short distance, so that the flame that was adjusted down could be in fuller contact with the bottom of the flask.

Last time, when Li Qing was "adjusting" at this step, the amplitude of the movement was too large, causing the shaking amplitude of the flask to exceed the experimental standard, and the two essentia of different forms and types inside the flask collided violently, and the flask exploded all at once, and the glass slag splashed all over the table.

As Li Qing adjusted, wisps of black and white steam slowly floated up the vertical long neck of the flask, and flowed into the zigzag condenser tube through the diversion port on the side of the neck.

It worked! Li Qing couldn't help clenching his fists, there was also chemistry in the curriculum of the primary education school, but at that time all the teaching was theory, and there was no chance to get started at all, in Wuningju, Li Qing experienced the joy of the success of the experiment for the first time, that is a sense of accomplishment of applying what he has learned and mastering new things, if he can experience this taste in the early years, maybe he will be able to have a strong interest in learning, and be successfully admitted to a higher education school to continue his studies.

At least for a moment, Li Qing thought so in his heart.

Song Qiu raised his hand and knocked on the back of Li Qing's head, and said, "Until the last moment, any accident can happen, watch attentively!" ”

Li Qing replied stupidly, he found that Song Qiu not only had extremely complicated feelings for the Special Investigation Bureau, but also became unusually serious when it comes to scientific research.

The lime water, which acts as a condensant, goes in and out, taking away the heat of the essentia steam inside the pipe, and the steam formed by the interweaving of black and white is re-transformed into a liquid, which drips down the pipe from the horn tube into the Erlenmeyer flask.

This is an essential step, and it is necessary to use lime water to condense the gas, only in this way can the gaseous essentia be liquefied back into liquid, and as for the principle of this, the transcendents of the Bachelor Sequence are still further exploring it.

Carefully repeating the above steps several times, when there was no more black and white steam in the flask, Li Qing pulled out the catheter in the Erlenmeyer flask, quickly plugged the crack with cotton, and then removed the flask, put out the alcohol lamp, and waited for the flask to cool down completely, and the experiment was completely completed.

It really worked! Li Qing held the prepared single essentia solution in front of his eyes, and when he saw the fruits of his labor, he was overjoyed, but compared to just now, this joy was undoubtedly much more subtle.

While Song Qiu breathed a sigh of relief, he couldn't help but show a relieved smile on his face.

This experiment is not difficult, it can only be regarded as an entry-level, and it looks simple, but in fact, there are quite a lot of pits inside, and Li Qing can complete the experiment without stepping on only one of the pits, which is already unexpected by Song Qiu.

I think that when Song Qiuxue did this experiment, he repeated it at least thirty or forty times and fried twenty or thirty glass bottles before he mastered the essentials and successfully distilled a pure single essentia solution.

At the beginning, a large part of the reason for the surge in scientific research funds declared by the Ningpu team was on Song Qiu, for this reason, he also did a special review in the team, but after the review, there was no change.

Of course, Song Qiu was self-taught at that time, and Li Qing is now taught by Song Qiu himself, which can be regarded as standing on the shoulders of "giants".

"Very good, I succeeded twice, worthy of being my student, with the style of my year! In this way, if you memorize the steps of essentia dilution and the main points therein, the lesson will be over for today. ”

Li Qing listened to the textbook with twelve points of concentration, and essentia dilution was the thing he was most concerned about, so he naturally listened very carefully, and he basically didn't get stuck in reciting it.

Song Qiu nodded frequently, and sighed in his heart, this child is really smart.

Thinking so, Song Qiu looked at Li Qing's back and instructed: "After going down, keep what you learned today in your mind a few more times, read more books in your spare time, strive to pass the entrance examination, and then apply for the university, aren't you interested in the culture of the Shang Dynasty and Shang Xiaozhen?" You can choose to study this direction, which is also very helpful for your transcendent path. ”

The examination is the final examination of higher education schools, and according to the regulations of the General Administration of Education of the Federal Republic of Yugoslavia, only those who have passed the examination are eligible to apply for various universities.

Li Qing's figure stagnated, and then returned to normal, "Okay, I'll declare if I have the opportunity." Secretly, he shook his head and smiled bitterly, thinking to himself, Old Song, you really think too highly of me.

……

When I returned to the Public Security Bureau from Wuningju, the sky outside the red brick building was already dark.

Wearing the stars and wearing the moon to read, this scene reminded Li Qing of the days when he used to study at night in the primary education school, and the days at that time always passed too slowly.

Passing by the door of the secretary's room, Li Qing was surprised to find that the light inside was still on.

"Zishu? You're not gone yet? ”

A slightly surprised voice sounded at the door, Xu Zishu, who was burying her head in the table, raised her head, and when she saw that it was Li Qing, she immediately stood up from the chair, stroked the black hair in front of her forehead, and said, "Li Ju, you didn't leave either." ”

Li Qing said jokingly: "I can't go, I'm working hard in the special department for you." ”

While speaking, Li Qing had already come to Xu Zishu's side, glanced at her desk, and asked with a smile: "It's so late, still in the office, what big topic are you studying?" Ready to send a paper? ”

"How can I have that ability, Bureau Li likes to joke," Xu Zishu's face turned slightly red, "It's not the '127' case, you said that you can dig deeper, and if you want to investigate again, I have already followed your instructions and checked again." ”

At this moment, there are only two people in the secretary's room, Li Qing and Xu Zishu, and the room is full of the voices of this man and a woman, it is now time to get off work, Xu Zishu also changed back into the clothes prepared in the office early, and at the same time he was able to show the charming figure of a young girl implicitly, and the bright light hit her delicate face, and the slender fluff on her face was clearly visible.

Xu Zishu's slightly flushed face is undoubtedly the most perfect interpretation of the word shy, in order to hide her inner emotions, she hurriedly found a topic and said: "By the way, Tang Ke came to you before, and he refused to leave after work, or I told him that you might not come back today, so he left unwillingly." ”

Li Qing let out a soft "um", casually flipped through the information in front of him, and saw the outline on it and the transcription in the notebook on the side, and knew that Xu Zishu was not prevaricating to cope with the performance, but really wanted to dig out something.

"You just said that you were investigating the '127' case, and after looking at it for a day, what did you see?"

This girl is serious, Li Qingzi will not chill her heart, she should ask this sentence if she is reasonable.

Xu Zishu's eyes flashed with joy, but then he became a little hesitant, and after Li Qing encouraged him again, he said: "Speaking of which, it was still the inspiration you gave me, Li Ju, to start with those women of Zheng Yongwen." ”

"I think that among the women who have an improper relationship with Zheng Yongwen, the one named Cheng Xinxin is the most suspicious."

Speaking of this, Xu Zishu's face couldn't help but flash an unnatural look, obviously very disdainful of Zheng Yongwen's behavior.

"Be specific."

Li Qing glanced at her, pulled out a chair and sat down, and stretched out his hand to signal Xu Zishu to sit too,

Obviously, the two are ready to have a "long talk".