Because it was the first time to do it, Qin Yu didn't have a good grasp of the amount, all ten boxes were full, and there was still more than half of the pot left. You can only wait for the soap in the mold to cool down and then take it out and pour it back in.

Finally, all the soap was poured, and more than fifty pieces of soap had been prepared.

"Sir, what is this thing we make?" Seeing more than fifty pieces of soap neatly arranged, Zhu Chun, the king of Shu, asked.

"It's soap." Qin Yu said, "But it's completely different from the soap you used before, the soap you used before was made of honey locust, and this soap is a pig pancreatic soap made by using the saponification reaction between fat and alkali. ”

"Can this thing really decontaminate?" The crowd was visibly skeptical. They had just seen with their own eyes that this thing was made of lard, and lard only increased the stain, not decontaminated it.

"Won't you know if you try it?" Qin Yu said.

When the crowd heard this, they excitedly stepped forward to test it.

First, wet your hands, then pick up the soap and rub it on the palms of your hands. Then the miraculous thing happened, the soap made of lard raw materials, not only did not make their hands dirtier, but produced a lot of foam, and it disappeared after one flush.

Wash your hands in water, and soon their palms will be clean.

Some people even took their own clothes for experiments, and they were cleaned by rubbing them with just their hands.

"It's amazing!" Prince Zhu Biao said excitedly.

"This stuff works so much better than the soap we used before!" Xu Miaojin exclaimed, "It's still very comfortable to wipe on your hands, but it's still prickly when you wash it with the soap you used to use." ”

"What's even more amazing is that it's cleaner than honey locusts." Zhu Yingrao said, "If everyone uses this thing to wash clothes, there is no need to pound clothes and pestle at all!" ”

"yes." Qin Yu sighed for a while, "If I had made it for you earlier, my 'Prada' would not have been broken." "Looking at the clothes with a hole in the rope not far away, I feel distressed.

……

"Yes, yes, that's a good thing!" Seeing the miraculous effect of the students' experiments, Xu Da also said.

After seeing it, the doorman on the side also said that it was really amazing: "Who would have thought that ordinary lard and grass and wood gray water could make such a useful thing?" ”

He has lived for nearly 100 years, traveled all over the country, and his experience is unparalleled. He has almost seen all folk remedies and folk tricks, but he has never seen soap made from lard.

"The fact that such a simple material can make such a useful thing is completely called wisdom!" Lao Dao thought in his heart, "He also said that it was a saponification reaction, what is the saponification reaction?" Don't understand! This young gentleman's knowledge is really extraordinary, no wonder Emperor Zhu attaches so much importance to him. ”

"I, Xuan Xuanzi, thought I knew the world and the world, but I didn't expect that in front of him, I still seemed a little ignorant. The sage cloud threesome must have my teacher, and I will not deceive him. ”

"This kid is a layman in martial arts, and my knowledge is also a layman in front of him. He previously said that chemistry is the study of material changes, and change is the essence of alchemy, and it seems that in the future, we will have to ask him more for advice. ”

Lao Dao hid a two-person high alchemy furnace in an extremely secret deep mountain, weighing thousands of catties. Previously, he traveled all over the country to find sesame grass, lead and mercury and cinnabar, because his cultivation was too high and it was difficult to make progress, resulting in his alchemy furnace Ding not being used for decades. There is no way to use the gold and stone as the outer dan, and the dragon and tiger fetal breath as the outer dan.

……

"Lao Zhang, your clothes are too dirty, you can wash out three catties of mud, give you a piece." Just then, a bar of soap flew towards him.

"I'm used to being sloppy, but I'm not used to it when I wash it." Lao Dao was stunned and stretched out his hand to catch it, and then wanted to throw it back to him.

"No way!" However, Qin Yu said solemnly, "You are the doorman of our Lujiacun Primary School, if you call Hanako to dress up all day long and flies follow, it will affect the overall image of the primary school, and it will also affect the children's learning and development." ”

"It's a duck to the shelf!" Lao Dao was very dissatisfied.

"If you don't think about yourself, you have to think about the students." Qin Yu pointed to the students next to him, "They are all flowers of the motherland, and you are smoked all day long by the stinking ......."

"It's a big deal, I'm staying away from them."

"You're so reluctant to give up your stinky mud?" Qin Yu was surprised.

"Okay, Lao Dao, try your best, let yourself have less mud on your body."

"Alright, the soap is ready." Qin Yu stood up, "Let's go, let's go back to the classroom." The teacher will teach you the chemistry of making soap, as well as the chemical equations involved. After learning the trim of chemical equations, it is clear at a glance how much of each material is appropriate, and there will be no waste of materials when making it in the future, and the soap made will be purer. ”

The crowd rushed back to the classroom and sat upright.

And Qin Yu walked in and taught them the chemistry knowledge without reservation, and was afraid that they would not understand, so he patiently explained it to them again and again on the blackboard.

Everyone has done it themselves before, and they are more interested in learning, and they are like playing chicken blood seriously. The memory is also firmer, and this teaching method has fully mobilized their enthusiasm.

……

Soon, it's time for the end of school.

"Has everyone learned?"

"Learned!"

"Okay, let's send the soap we just made to every household now, so that they can also use this new pig pancreatic soap." Qin Yu said.

This is done in order to contact the feelings of the villagers, he is already a member of Lujia Village, and it is very necessary to do a good job in the relationship between everyone who looks up and does not look down in the future.

The second is to let the villagers see the power of science, and in the future, he wants to do something 'out of the ordinary', such as letting them change to cash crops, build roads, and so on, and so on, the implementation will be smoother.

Of course, the most important thing is that he is also changing the backward appearance of Lujia Village by doing so.

In Lujia Village, everyone used pig pancreatic soap instead of the backward honey locust.

Definitely the progress of civilization!

"Knock knock!" Qin Yu came to the top of the house and knocked on the door.

"Squeak" The door opened, and the old patriarch walked out, "It turned out to be Mr. Qin." After seeing Qin Yu standing in front of the students, the eighty-year-old patriarch immediately saluted him.

"We're not here today for anything else, just to give you a bar of soap." Qin Yu said.

"Soap?"

"That's it." Qin Yu handed him a piece of soap, "This thing is made of lard and plant ash, you can take it back and try it, it is much better than the original honey locust soap." ”