Chapter 135 (1/2)

”Did you forget to button the quality of the watch dish...” Shen Yiyun lifted his glasses in a panic, pressed a few times at the electronic scale, and then swallowed his saliva and looked at the screen again.

The shiver was more intense.

The expression also tightens.

”This It's impossible Why so many... ” Shen Yiyun trembled to get up and asked Shi Yangzhi, ”you piperidine clearly added a milliliter, am I wrong?”

”Yes.” Shi Yang still did not have the courage to look directly at the big sister, only revealed a rich side face for her sister to look at, ”but not an extra ml, but 0.78 ml.”

Shen Yiyun grabbed his head and said: ”a drop has 0.05 ml, how can you be accurate to 0.01!”

”What else would you do with a high-precision syringe?” Shi Yang then aimed at the syringe on the table, ”within 0.5 ml, I can use my hands.”

”Even so...” Shen Yiyun put his hands on the table and asked reluctantly, ”why 0.78? By what? ”

”Hum.” Shi Yangmeng raised his eyes and raised his mouth slightly, ”feel.”

”Yiao...” Shen Yiyun is glasses a fall, almost burst out of rude, ”this also can depend on feeling?”

Li Zheng is sandwiched in the middle. He only feels that the atmosphere between them is very terrible, which seems to be even more terrible than the decisive battle on the top of the Forbidden City.

What's more terrifying.

He doesn't really understand.

It's OK. I'm not ashamed to ask.

”Well, I compare dishes Ask a little Li Zheng went to the stage and picked up the piperidine reagent bottle. ”In this reaction, piperidine acts as a catalyst, right?”

Shen Yiyun replied, ”yes Normally, the molar ratio of piperidine to diethyl malonate should be 1:1. In our reagent concentration, the volume ratio should be 1:10, that is, every 10 ml of diethyl malonate corresponds to 1 ml of piperidine. ”

”It's just the most conservative strategy.” Shi Yang laughs, ”conservative, it is impossible to make high yield.”

Looking at the white crystal in front of him, Shen Yiyun said: ”the problem is here. Increasing the dose of piperidine can increase the yield, but the alkaline and negative carbon ions will also increase, which will lead to the further formation of amides with ethyl coumarin-3-formate, which will greatly reduce the yield.”

”So heating and refluxing should be fast.” Shi Yang moved his fingers and sneered, ”compress the standard heating process of one and a half hours to within one hour. You know, the heating reflux is dynamic, the internal pressure and the reaction liquidness are changing all the time. Therefore, it is impossible to achieve the fastest reaction rate only by using conservative constant temperature. Only when I constantly observe, can dynamic adjustment be possible.”

”This Is that part of your calculation? ” Shen Yiyun was shocked. ”I thought you were just robbing time...”

”It's time grabbing, but it's not calculation, it's feeling.” Shi Yang stressed again.

”Feeling...” Shen Yiyun couldn't understand, ”chemical experiments, how can we rely on our feelings...”

”It's just that you haven't done enough.”

“……” Shen Yiyun scolded him and beat the table with anger.

I Not enough?

One month's study I was crammed into the lab by my tutor Working 10 hours a day

That's not much?

For the first time, Shen Yiyun wanted to beat people.

In Li Zheng's vision, a quiet big sister is gradually evolving into a grumpy elder sister.

But at the same time, Li Zheng also tried his best to absorb the spirit of learning.

It is absolutely not formulaic to follow the standard process for a really good chef to cook.

He will dynamically adjust the cooking method and the dosage of seasoning according to the freshness of the ingredients, the state of tenderness, the handle of the pot, the oil and other factors.

These adjustments can never be quantified.

It's feeling, it can only be feeling!

Only after years of immersion, self-improvement, unwilling to fall into a certain relaxed fixed process, always thinking of constantly challenging ourselves, can we cultivate the feeling.

By contrast

Li Zhengwang looks to Shen Yiyun, who is holding the table empty.

Although the big sister is also one in a million.

But they are shackled by the heavy and repetitive work in the laboratory

Gradually followed the process and gave up the brain.

Enjoying the convenience of shortcut, ignoring the growth of thorns.

Sister.

You.

It's lost.

”Well That can't be so much... ” Shen Yiyun, staring at the crystal, said, ”the biggest product loss in this experiment is that one step must be washed with 50% ethanol, but at the same time, the ester will also dissolve in ethanol The loss of product in this step is inevitable. ”

”Of course I know that.” Shi Yang step by step to the wall, quietly patted a small refrigerator, ”sleepy people, can't see the morning sun.”Shen Yiyun instantly stares: ”ethanol It's too cold

Li Zheng hit both hands.

Wonderful.

With the decrease of temperature, the reaction will slow down, but the effect on washing effect is very small.