"Hehe, yes, Dean Zhang is really sharp-minded!"

Chen Xu smiled and nodded, then turned his head to look at a circle of people and said: "Many people know that this kind of bile alum is produced in copper ore, and bile alum actually contains copper, and many copper ores also contain sulfur. When the copper sulphate is combined with water, it becomes a blue ore, and in the process of heating, the water is destroyed by the high temperature and evaporated, and it becomes white, and now I put it in the water, and the copper sulphate combines with the water to become a blue liquid......"

"Master Hou, why did the copper sulfate disappear when it was put into the water, shouldn't it turn into blue powder?" Another professor at an engineering college asked loudly.

"You have all eaten salt, salt is also crystalline or powdery, but it can be dissolved in water, this copper sulfate can also be blended with water, if the copper sulfate solution is constantly heated and cooked, then you will get some blue crystals, that is, mashed bile alum, this is actually the same principle as boiling salt and drying salt."

"I see, Master Hou will understand it when he explains it this way!" Many nodded their heads.

"Master Hou, since you said that this copper sulfate also contains copper, can you refine copper?" A craftsman asked.

"Naturally, it can, but the process is more complicated, it is not like ordinary copper ore to be heated and smelted, and other things need to be burned together, this Benhou will gradually talk about it in the future, and copper sulfate is toxic, heating with a crucible will release a kind of rotten egg-like poisonous gas, if you want to test it yourself, you must do a good job of ventilation protection measures, okay today the laboratory has just started to prepare, Benhou needs to prepare for a few days, and then you will be notified to the College of Engineering to listen to the class, And I'm going to show you even more bizarre chemistry......"

"Okay, everyone please go out, don't delay Lord Hou's big business!" A vice president of the Academy of Sciences blasted a group of craftsmen and teachers out of the laboratory like a bombing chicken, and the scene of commotion quieted down.

"Whew~" Chen Xu touched the sweat on his forehead, feeling a little hypoxic by a group of people.

"Master Hou, this chemical reaction is really amazing, it feels much more interesting than the art of Gewu!" Zhang Cang walked around the laboratory with great interest, holding bottles and jars of glassware and ores of various colors to look at.

"Chemistry is indeed a very magical science, at the moment in the development of people's livelihood is not as good as Gewu, the purpose of research is to understand some strange changes in nature, in order to better develop the art of Gewu, but with the continued development of science, chemistry must keep up, and chemistry is widely used in disease prevention and medicine, is irreplaceable by physics, but chemistry is too complex and nuanced, for the experimental equipment and experimental conditions are very harsh, careless will cause disaster, so the experiment should be cautious and ......"

Zhang Cang was busy, and after chatting with Chen Xu in the laboratory for a while, he said goodbye and left, and when he left, he specially told Chen Xu to inform him next time he went to class.

After Zhang Cang left, Chen Xu finally quieted down and began to direct a few alchemists to continue distilling alcohol, while he himself assembled a dry distillation equipment and put the pounded bile alum into the flask for dry distillation.

In chemical experiments, acids and bases are the most commonly used preparations, and the easiest ones to get out at the moment are calcium hydroxide and dilute sulfuric acid.

The calcium hydroxide solution is lime water, which is the simplest.

And sulfuric acid is relatively more complicated, you can burn sulfur to get sulfur dioxide and then pass into the hot air to continue the reaction to generate sulfur trioxide dissolved in water, you can get sulfuric acid, but this method gas is not easy to collect, but also easy to poison, the simplest is high temperature dry distillation of copper sulfate, although the yield is certainly not high, but it is better than the simple operation, this method has actually been discovered in the Tang and Song dynasties in China's Taoist priests.

Chen Xu had been accumulating some knowledge about chemistry as early as when Xiaohe Village began to develop gunpowder.

I don't remember much, the most important thing is some simple chemistry knowledge learned in junior high school and high school, and some reaction formulas about common acids and alkalis can still be remembered more or less after constant recollection, but I am afraid that most of them are specious or even wrong.

It doesn't matter if it's wrong, what matters is that it can open a different door for the Fang class of Great Qin, so that they no longer use the most primitive smelting method to refine pills, but can use clear and observable experiments to get closer to real chemistry.

The latest issue of Daqin Metropolis Daily was published, and in addition to the general court edicts and national news trends on the front page, a very novel news appeared this time.

"On the fifth day of July, Qinghehou will give an interesting lecture on chemistry experiments at the Academy of Sciences, the content is not only novel, but also will show many magic effects of the general test effect, this is a new scientific exploration, because the space is limited, please make an appointment in advance for all those who are interested in science to go and observe!"

The content of this lecture news is not much, but it has caused a huge response from the people, especially some monks, who are particularly sensitive to the word magic, and after seeing the newspaper, they can't wait to run to the College of Engineering to sign up, and there are hundreds of people registered in just one hour, and the reserved observation positions of the School of Engineering are all used up, but there are countless Fang Dao warlocks who ask to participate in the lecture, and finally Hu Kuan has won Chen Xu's opinion, and issued fifty audit places, but it is still a drop in the bucket, but in view of the limited space in the classroomIn the end, many people had to go home.

During this time, Chen Xu also went out early and returned to the laboratory every day to continuously tinker, not only to get out some acid and alkali solvents, but also to verify some simple chemical reaction experiments.

The Xianyang autumn in early autumn is high and refreshing.

Large tracts of farmland on both sides of the Wei River have turned golden with their crops, and many farmers have already begun to harvest their autumn grain.

This early autumn is no different from previous years, but for the peasants, this is another season to increase production and harvest, and according to the implementation of the five-year plan of the Qinghe Hou, this year's peasants' grain tax has been greatly reduced to three taxes and one, which has increased the enthusiasm of the peasants across the country to grow grain several times, and the grain harvested per mu of land will be reduced from less than half of the original to more than half of the family's rations, so this year there is no need for the urging of county officials, and most of the peasants have already prepared harvesting tools and are ready to do a big job. As long as the grain is returned to the warehouse, the whole family will no longer go hungry because of lack of food next year, and even the surplus grain can be sold in exchange for money to buy new farm tools and clothing.

And for the people of Xianyang, this autumn is also colorful, not only more and more commercial houses in the city are becoming more and more abundant, buses have been opened to several surrounding counties, and almost all of the cement roads connected to each other are being built within the scope of the Inner History House, and many main roads in the city are also reconstructed and paved with cement roads, especially the huge Keju commercial square on the south bank of the Wei River, under the construction of tens of thousands of people in full swing, after more than a year, it has now taken shape, and a huge building is rising from the ground. At present, the two-storey grandstand has been built, the densely built scaffolding looks extremely majestic and magnificent, and the surrounding supporting commercial plaza is also being leveled and built in a large area, all kinds of wood and sand and gravel cement are piled up into a mountain, the planned square and commercial buildings cover an area of 500 acres, the majestic construction site attracts countless people every day, even the emperor has to inquire about the progress of the project of Keju Square every few days, and obviously has great interest in this project.

Xianyang City is even more lively, in addition to the business travel between the east and the west, north and south, from time to time you can see the Hungarian merchants driving horses and cars in the crowd, and even the red-haired, yellow-haired, high-nosed, deep-eyed Yueshi people.

After the three princes went to various places to establish a dynasty and become kings, in the face of such a primitive and barbaric country under their rule, the first order they issued was to form a caravan and start to communicate with Daqin, in addition to trading grain, cloth, pottery, pen, ink, paper and inkstone and other daily necessities in the Central Plains, but also silk, tea, wine, porcelain and glass and other luxury items, of course, every issue of Daqin Metropolis Daily published by Daqin and every book on the market were purchased and transported to the fiefdom in large quantities.

Only through newspapers and books can they learn about what happened in the Central Plains and the orders and changes of the Xianyang court as soon as possible, so as not to miss many important things due to the serious backwardness of information.

After all, as a vassal state subordinate to Daqin, everything in the fief must be supported by Daqin, especially the various items innovated and invented by Daqin, who are accustomed to the prosperity and prosperity of living in Xianyang, and the barbarian land where birds don't can say nothing, even the barbarians can't understand what the barbarians say, not even the thatched toilet, several princesses cry every day to return to Xianyang, which makes several kings very angry, and the tribal leaders of the Huhuyue clan are beaten like grandsons almost every day.

On the fifth day of the seventh month, Xianyang suddenly became more noisy, and countless monks rushed to the engineering college in groups, along with countless hundreds of disciples and ordinary people who watched the excitement, and even officials and businessmen among them.

Before the time came, the outside of the Institute of Engineering was already overcrowded, tens of thousands of people gathered on the street, and the gate of the College of Engineering was even more blocked.

At the end of the morning, Chen Xu came to the College of Engineering in a luxury four-wheel drive off-road vehicle, and was startled by the bustling crowd from afar, but watching Chen Xu's carriage come under the escort of a group of guards, the crowd quickly got out of the way under the drive of the forbidden army, and in the cheers of countless people's surprises, Chen Xu sat on both sides of the carriage and smiled and waved through the welcoming crowd to enter the College of Engineering.

A large number of carriages and horses have been parked in the College of Engineering, and thousands of people are waiting at the door of one of the largest classrooms to tiptoe to visit, and when they see Chen Xu's carriage coming in, they greet them and salute together.

"I'm waiting to welcome Qinghehou!"

"Greetings to the left minister!"

In the chaotic greetings, Chen Xu got out of the car and swept his eyes, and found that not only most of the people from the Academy of Sciences came, but almost none of the professors and students of the College of Engineering were pulled, in addition to this, there were many agricultural colleges, liberal arts colleges and health centers also came to join in the fun, and there were more than 100 monks wearing Taoist robes in Taoist buns, and there were even many officials wearing official robes.

Xu Fu, Zhang Cang, Hu Kuan, Sun Shuyi, Chen Ping, An Yuliang, Gong Shengsheng, Tang Ting and a group of other people all stood at the front, each with a different nameplate on their chests, and after some noisy shouting, a group of people hugged Chen Xu into the classroom.

There are long tables and stools in the classroom, Chen Ping, Zhang Cang and a group of people with heads and faces are sitting in the front, and the rest of the people have also arranged some seats according to their identities, but the classroom is full of less than 300 people, and most of them can only stand in the aisle or the corridor outside the classroom to watch.

On the podium, a lot of experimental equipment made of glass has already been arranged, and some bottles and jars are also filled with different test materials of various colors.

Chen Xu didn't say much, walked straight to the podium and watched and sorted out the test equipment and materials, and waited for the crowd who came to listen to the lecture to find their respective positions and sit and stand, then gently knocked the blackboard a few times with the whip, and the classroom instantly quieted down, and hundreds of people all looked at the podium together.