Learning Demon Cultivation System

Because I have seen Lao Li Pi all the year round, his hand is also very famous and quite imposing.

The strong guy and little glasses next to him were already stunned.

It was far more shocking than when Shi Yang saw Li Zheng talking with Shen Yiyun for the first time.

fuck you.

Our rank.

It's a little bit worse...

The two looked at each other peacefully and cherished each other.

Up to now, there is only holding hands to form a ring.

Chapter 148 Is this ___ again? (Single University) (repair)

After all the students formed a circle in twos, Hu Zengwu opened the slides and started the experimental teaching.

His style is obviously different from Zhou Yi's, and is more rigorous. He is meticulous and standard in every step, and he will not skip things that are taken for granted (just what he thinks) like Zhou Yi.

But at the same time, there is also a taste of studying one by one, and it is unlikely to have any sense of impact. It can be said that it is not much different from self-study.

Of course, it's not his fault, after all, a wonderful person like Zhou Chenghuan is so rare.

At present, Hu Zengwu's rhythm is naturally a little sleepy for Li Zheng, but he still insists on listening hard, mainly to correct some unhealthy tendencies that Shi Yang has learned.

Just like "glide in neutral" when learning to drive, the speed is medium, and when you see a red light in the distance, hang to neutral and slide over with inertia. Points will be deducted.

An old driver like Shi Yang is naturally full of such coquettish tricks, so he shouldn't learn all of them. Maybe a certain operation was safe in the environment at the time, but it's hard to say if it's another condition.

As an apprentice of Shimen, Li Zheng can be regarded as a half-wilder. It is not useless to come back to understand the rigor of pedantry.

After an hour of effort, the basic experimental routines were explained.

After a 10-minute break, Hu Zengwu asked Shen Yiyun to distribute the experimental test questions and materials.

One paper for each person, plus a small bag of industrial salt mud, and the rest of the required reagents have been placed on the shared laboratory table before class.

Most of the students were a little flustered when they started to play real questions. Even if they are theoretical masters, there were very few opportunities for experiments in the past.

A small crewmember in the front row glanced at the paper and raised his hand and said, "Mr. Hu, you will take us to do it first, right?"

On the stage, Hu Zengwu closed his notebook and shook his head with a straight face.

"This experiment, the knowledge and skills required, have been taught to you in the last class."

"The experiment time is one and a half hours."

"I will group them according to the results. Those who meet the standard will go to my small experimental class tomorrow, and those who fail to meet the standard will let Yiyun continue to make up the foundation for you until you meet the standard."

"You are all top-notch, and you must be aware that we are selecting the top-notch ones to represent Jijing to communicate with the top-notch ones across the country. Therefore, the big pot meal is not suitable for the current situation."

"Finally, let me emphasize once again that all the knowledge and skills you need have been taught to you."

"If your abilities are outstanding, even if this is your first experiment, you can still produce results that meet the standards."

After speaking, he raised his arm and glanced at his watch: "The experiment has started, it is now three o'clock, and the report should be handed in before 04:30."

rumbling...

The students dared to speak out but did not dare to scold.

Co-authoring this old man is only going to teach his favorite players?

Leave the rest to this half-baked senior?

Even more frightening is-

What did you teach last class?

Some people are confused, some people are angry.

Some people have already gone to the public laboratory table to grab reagents.

Li Zheng and Wu Shu were the first to bear the brunt, grabbing the reagents needed for the first step.

"I'll bring 50 milliliters of sulfuric acid, enough for the two of us." Li Zheng grabbed the sulfuric acid bottle marked with a concentration of 25%.

Wu Shu took advantage of the opportunity and picked up the vial containing the light yellow liquid: "Okay, is 40ml of sodium hypochlorite enough for me?"

"25 is enough."

While others were still reading the paper, the two had already poured the salt mud into the beaker.

Half a minute later, the rest of the talents rushed to the test bench one after another, scrambling to grab the reagents that the two had taken.

Hu Zengwu remained expressionless, pulled a chair and sat down, called Shen Yiyun who was next to him and said, "Li Zheng's reaction is fast and normal, what is the theoretical number of Wu?"

Shen Yiyun quickly flipped through the materials: "Ninth, the best result of the affiliated Renda University this year."

"Taught by Sun Leyang?"

Hearing this name, Shen Yiyun's voice gradually softened, and he didn't dare to say more: "This... I don't know either."

"Since it belongs to Renda University, it must be Sun Leyang." Hu Zengwu smiled disdainfully, "People like Sun Leyang are not good enough to survive in the scientific research circle, so they have to squeeze into the education circle. If you enter the education circle, you can get in. He is not honest. Teaching and educating people, specializing in competitions, only know how to do some strange tricks, teach students to take shortcuts to solve problems, and finally teach a bunch of problem-solving machines to me."

"Yes...isn't it..." Shen Yiyun heard Hu Zengwu complaining about Sun Leyang almost every month, and he had already formed a habit of responding.

According to my brother, it seems to be related to Hu Zengwu's emotional problems in his youth...

As for specifics, no one knows.

After all, this is Hu Zengwu's absolute culprit, so don't mention it.

"It seems that Sun Leyang has hit the right question again this year." After Hu Zengwu scolded enough, he shook his head again, "Yiyun, I didn't mean to embarrass his students, it's just an objective fact, don't go out and talk nonsense. "

"Don't say...don't say..." Shen Yiyun didn't dare to talk too much, and hurriedly took out Shi Yang's materials, "It's rare for you to have time, so let's take a look at Shi Yang's previous grades in advance, his father just sent it."

"Well." Hu Zengwu took the materials, flipped through them and said, "How is Shi Yang?"

"Still in the hospital, Dean Zhou means that even if he can't come, try to keep him a place."

"Well... don't make any trouble about this matter. It is Zhou Yi's business whether to give a quota. I should get as many points as I want here." Hu Zengwu put down the materials and said in a low voice, "This selection, so many parents and people in the system People are watching, if Shi Yang doesn’t come, he will be sent to the National Judgment, who will be responsible for the trouble?”

"Yes, but I am sure of Shi Yang's experimental level. He is really, really good, at least as good as Li Zheng."

"I know, I trust you." Hu Zengwu raised his hand and said, "Don't talk about this again."

Shen Yiyun frowned slightly. If the two heavyweight teachers strongly recommended Shi Yang, the Chemistry Society would have a reason to accept their opinion and recruit Shi Yang into the national competition, so she wanted to fight again, so she gritted her teeth and said, "Mr. Hu, I can produce Shi Yang's evaluation report, you can revise it, and then jointly sign it with Dean Zhou and submit it to the Chemical Society, which should help Shi Yang win it."

"Absolutely not." Hu Zengwu glared at Shen Yiyun, "Are you afraid that you won't cause trouble for yourself? In this room, which student has no family background? It's really entangled. In the end, it was your report. He Zhou Yi is fine Now, how do you explain? We just take care of our own part and don’t cause trouble.”

"Okay..." Shen Yiyun was unwilling to bow his head, and did not dare to say a word.

For Shi Yang's matter, she had already said a lot of good things in front of Zhou Yi.

But now it seems that although Zhou Yi has intentions, he has never met Shi Yang before, so he doesn't dare to be too firm.

Hu Zengwu was wise and safe, and forbade himself to speak for Shi Yang again.

If things go on like this, this chemical pervert, who is threatening to go to Prague to show the world the guy who prepares special substances... I'm afraid he's going to die in the anorectal hospital.

After all, Shen Yiyun was very soft-spoken and couldn't say anything more, but silently followed Hu Zengwu's pace and patrolled the experiment together.

On Li Zheng's side, the effort of heating the solvent had already cleared up the idea of ​​the experiment in his mind.

Extraction of magnesium sulfate heptahydrate from salt mud.

Rather than extracting what is needed, it is better to filter out unwanted impurities.

After all, in industrial salt mud, in addition to the target element magnesium, there are also various chemical components such as calcium, iron, aluminum, and manganese.

In order to extract "magnesium", the salt mud must be acidified first to make a solution, and then the unnecessary things in it are chlorinated and hydrolyzed into hydroxides, which are precipitated into solids, followed by suction filtration.

Finally, the remaining magnesium is used to crystallize magnesium sulfate heptahydrate.

There are many processes, but the principle is simple.

The core is only at one point - PH value.

In this experiment, each substance to be filtered off by suction will precipitate as a solid at different pH values.

As long as the theory is passed and the pH value of each substance is fully precipitated, the final result can always be quite different.

However, if you are a novice in the experiment, you will most likely only look at the steps of rolling the noodles, follow the script, and will not think deeply about the reactions of each step, so as to carefully adjust the pH value.

After thinking about this, Li Zheng couldn't help turning to Wu Shu, worried for her.

Wu Shu's progress here is a bit slower, and his movements are not so proficient. It seems that he is not trying to make up for the experiment.

Li Zheng suppressed his throat, and said softly, "The pH of ferric hydroxide is 3.2, and aluminum hydroxide..."

Wu Shu raised his hand suddenly, without looking at Li Zheng, he said calmly, "I can do it myself."

"But you have been deducted points just now." Li Zheng said in a deep voice, "The time given by Hu Zengwu is very short, there is no room for mistakes at all."

"I know, then I can do it myself." Wu Shu lowered his head, carefully stirring the salt mud slurry, his face was more serious than before, "If I do this again, I will get angry."

Seeing her appearance, Li Zheng finally nodded and returned his attention to his experiment.

This guy kept saying that Ou Xingzhuo valued his self-esteem too much.

It's a hundred steps to laugh at fifty steps.

At the same time, Hu Zengwu led Shen Yiyun to patrol back and forth, telling Shen Yiyun from time to time that she should record in the notebook, which should be deduction of operating points.

Other than that, there is no guidance.

Basically, it is clear that the top students are selected into the small class.

What Li Zheng didn't quite understand was that since it was a screening, a comprehensive inspection should be done, but Hu Zengwu just stood behind Wu Shu for a long time, recording a lot, as if he was waiting for her to make more mistakes.

Instead, Li Zheng just glanced at it and passed by.

Under the inspection of the two examiners, it was obviously just a mock experiment, but it was like a final exam.

Since there are many experimental steps and they are very dense, it gets quieter as you go to the back.

In the meantime, some people kept making mistakes and asked for some salt mud to start all over again, most likely because of the deviation of the pH value.

In the formal exam, 20 points will be deducted for redoing the experiment, and considering the time issue, the prepared questions can almost declare 0 points.

Such a tense atmosphere lasted for nearly an hour.

What broke the atmosphere was a "di" sound.

Many people are familiar with experimental equipment, and this sound has only one source——

Electronic balance.

Hearing this voice means that someone has made a product.

Follow the reputation.

Li Zheng was putting a watch glass with a mass of white crystals on the balance, looking at the numbers and filling out the experiment report.

Most people have the same voice in their hearts.

This is it again?

Damn cobalt god, when are you coming? Hurry up and fix this kid, I can't stand it anymore!

On Li Zheng's side, when he finished filling out the experiment report, Shen Yiyun and Hu Zengwu also visited.

After Hu Zengwu glanced at the electronic screen, he picked up Li Zheng's final report.

【Theoretical yield: 3.41g】

【Actual yield: 2.78g】

【Actual yield: 81.5%】

"Yes." Hu Zengwu returned the report to Li Zheng blankly, "Take the good things and go to the next door to do the assay. Everything you need is ready."

"Congratulations~" Shen Yiyun raised an eyebrow quietly.

When the surrounding students heard this, they already realized it.

Li Zheng was forced to enter the small class.

Hu Zengwu's small experimental class must have been carefully cultivated and went to the National Finance...

If you don't go in... then you can only let the unreliable senior sister tutor you, no matter how you think about it, you will be killed by cannon fodder.