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Listen to the students' complaints.

Ren Yan laughed to herself for five minutes before she stopped when the boys looked at her with almost murderous looks.

Then he cleared his throat, still looking at the group of boys with a smile, and said seriously:

"You can't blame the teacher for this. It's really due to pressure."

"You also know that if you don't do this, you will most likely not be able to learn."

"Okay! We won't argue with you anymore, just tell us how to use the tools!"

Seeing Ren Yan's obedient face despite taking advantage of the situation, the students in Class 9 instantly felt their blood pressure soar, but in the end they could only grit their teeth and proceed from a rational point of view.

I understand my class teacher who specializes in treating anemia.

"Okay, okay, no more joking with you guys."

Ren Yan took a deep breath, adjusted her emotions and said:

"In fact, the so-called rust is the oxidation reaction between iron and oxygen in the air. The product is ferric oxide, which is the rust you can see."

With that said, Ren Yan picked up a branch and wrote down the reaction equation between iron and oxygen on the ground.

"This is chemistry?" the students asked in confusion.

"Yes, it's chemistry." Ren Yan nodded: "Since rust is produced through chemistry, it can naturally be eliminated through chemistry."

"And removing these rusts is your next task."

"But I have to remind you that the rust you see is not just iron oxide, but a combination of various impurities."

"As for how to remove it, you need to think about it yourself."

"All the teacher can tell you is the general method of removing rust in a conventional factory."

"There, they often use acids and alkalis to also remove light rust."

"And I have prepared some basic chemicals for you here. Whether you can successfully remove the rust depends entirely on you."

As he spoke, Ren Yan pulled out a bag from behind and took out various bottles and cans.

He bought this in the imperial capital after seeing a rusty tool.

They are all very common pharmaceuticals, and there are no restrictions on purchasing them in small quantities.

"Oxalic acid, tartaric acid, citric acid, dextrin, sodium molybdate, phosphoric acid, glycerin."

Looking at the names on the bottles and cans, the students in Class 9 suddenly felt dizzy.

The original feeling of being in chemistry class came back.

"Don't look at me like that, I'm not forcing you." Ren Yan curled her lips and made a half-tilt motion again, leaning on a sheep behind her.

Not to mention, it is much more comfortable to lean on a living thing than on a dead thing.

When Ren Yan approached the sheep, she just turned around and said "baa", then started to eat grass.

Looking at the students, I felt a burst of physical pain.

We are racking our brains and you are enjoying your life?!

Can you have some self-consciousness as a class teacher?!

The students sighed again, and took these bottles and jars and prepared to go to the girls' place, so that everyone could study them together.

After all, relying on themselves alone, they might not be able to figure out what's going on until they die.

Seeing the students leaving, Ren Yan shouted: "Hey, by the way, it's best not to touch those reagents with your body, it will be more or less harmful!"

"Especially sour!"

"Also, I have a book about rust removal. You can read it."

With that said, Ren Yan waved to the students and threw a pamphlet.

Looking at the fallen pamphlets, the students' mouths twitched again.

‘How many books does my teacher bring~’

After returning to the girls, the boys recounted what they had discovered about Teacher Ren setting them up in a more elaborate manner.

This caused the girls to start hating each other.

And they expressed it one after another.

They must not ask Teacher Ren again today!

What if the other party sets a trap for me again?!

Therefore, from now on, the rust removal work can only be completed by them alone!

Immediately, everyone plunged into the sea of ​​rust removal.

After nearly two hours of brainstorming, the students finally had a general understanding of the process of rust removal.

In fact, to put it bluntly, it is to allow the rust to be reacted, corroded, and volatilized in the acid, and the concentration of the acid needs to be controlled.

Otherwise, it will easily corrode the main body as well.

Of course, in order for the prepared acid to be more effective during this period, some rust stains that are easy to clean need to be polished off.

The things used in the book are iron brushes, iron pins and the like.

And here, apart from some rusty tools, the only things the students can use are some scattered stones and a large plastic bucket of drinking water that has been filled before.

Fortunately, after using these things properly, they could barely remove the rust on the surface of the tools.

"Then the next step is to prepare the rust remover."

After all the tools were initially derusted and washed to remove most impurities, everyone turned their attention to the chemical reagents Ren Yan gave them.

The number of these reagents is not very large, and after two hours of research, they finally got it.

They found that these reagents could prepare up to three bottles of rust remover.

Therefore, there are not many trial and error opportunities left for them.

"Let's confirm again before mixing." Looking at the reagents in front of him, the squad leader suggested.

Others nodded.

"The acid content of each preparation should not be too much. Just use 1-2 acid solutions and mix them."

A classmate said:

"Also, the ratio of organic acids, dextrin, water and glycerin must be controlled within the range of 18:1:60:1, otherwise it will be difficult to achieve the desired reaction effect."

“There are also additives”

Following the students' words, some chemical equations about rust removers were neatly listed and written on the ground.

Looking at these key points, Xia Yue took a deep breath and started the preparation work.

Among all the students currently, Xia Yue has the steadiest hand, so this job falls on her.

As the reagents dropped into the same container bit by bit, the reactions described in the book were presented to everyone one by one.

Look at the solvent that sometimes evaporates, sometimes changes color, and sometimes makes noise.

The students suddenly experienced a different feeling in their hearts, as if they were creating a new thing with their own abilities.

Full of incredible and novelty.

But these all actually appeared before his eyes.

As the last drop of reagent dripped, the solvent completely returned to calmness and its color turned transparent again.

However, the new solvent is slightly more viscous than the previous reagents.

"Is this the rust remover?"

Looking at the solvent in front of them, the students still couldn't believe it.

"That should be the case. We have integrated everything described in the book in a perfect manner. It should be no problem and absolutely correct."

Li Cheng said aloud.

"Then let's try it now! See if it can remove rust." Li Qi followed.

The other students didn't doubt him, and watched Xia Yue drop a small amount of rust remover on the rusted saw blade.

One second, two seconds.

One point, two points.

As time goes by, a layer of rust gradually emerges from the small area where the rust remover has been removed.

After Wang Bo rinsed it with some water, most of the rust on the original area had disappeared.

It is replaced by the original metallic color of the saw blade.

Although there are still scattered rust spots, there is no doubt that they succeeded!
To be continued...