How do you make crystals out of alum? What is the practice of alum crystallization?

Homemade crystals It must be fun to keep them on the windowsill. If you add some food coloring.

It also allows it to grow any color you want.

One of the keys to making your own crystals is to find the right chemistry. You may have seen copper sulphate and potassium permanganate in school.

Both of these reagents are highly toxic, so neither is easily available at a nearby pharmacy. If you ask very politely, maybe your natural science teacher will give you a little sample.

In this chapter, we decided to use potassium aluminum sulfate.

The common name is alum.

It is non-toxic and is commonly used in bread making to increase the whiteness of bread. Although almost every family has it, you still have to be careful not to get it in your eyes. 100 grams of alum is enough to make crystals. Alum can also be used to prevent fire and tan ** in the sun.

We'll talk about this in another section. It can also be used as a hemostatic agent when ** is scratched, or it can be used to make crystals as a deodorant under the armpits.

Material preparation: 10 g of potassium aluminum sulfate (alum).

A large tumbler.

A lollipop stick washed with a warm water line.

Some small stones.

Preferably with raw edges.

Method: 1 Be sure to wash the stone – preferably under running water.

2 Fill the cup with enough warm water – cover the stone (about 1 3 points in the cup), but don't put the stone in it yet.

3 Add the alum to the cup and stir with a lollipop stick until the alum is no longer easily dissolved. There may be some alum particles left at the bottom of the cup at this point, so you can just put the stone into the cup, or the more classic method as shown in the picture below: tie a thread to a small stone, and wrap the other end of the thread around the lollipop stick.

We used both.

4 If you want to add food coloring, this is the stage. Then, you can proudly show it to your parents and surprise the mom and dad who always pat you on the head and call you baby.

Evaporation is the key to making these little crystals well, so be sure to keep the cup in a warm place. It will take a few days for the first crystals to appear, and it will take a few weeks to see all the crystals. If you want to get a large crystal, you need to tie the small pieces of crystal that you started to make like a small stone at the beginning, and then repeat the above process.

The crystal you see in the picture above** is one of the crystals we cultivate: the one on the left is smaller, and the one on the right is large and round, which we made at the bottom of the cup in a variety of ways, and it looks more impressive than natural crystals. It took 6 weeks before and after making this crystal, and we kept adding alum to the cup.

Prepare the eggshell first Remove the inner membrane of the eggshell Apply white glue Sprinkle alum on the inside of the eggshell Pour half a cup of alum into the cup Pour hot water into the cup and drip in the pigment After putting the eggshell in the cup, wait for 14 hours and the colorful crystallized egg is ready!

The little brother uses alum to make "crystals", which are as full as candy, and it is an eye-opener after reading it!

【Principle】There are two methods for preparing crystals from saturated solutions, and for solid solutes whose solubility is not affected by temperature, the method of evaporating solvents is commonly used. For solid solutes whose solubility increases significantly with increasing temperature, such as copper sulfate, alum, potassium nitrate, etc., the method of cooling hot saturated solution is commonly used.

Supplies] beakers, surface dishes, iron stands, alcohol lamps, asbestos nets, funnels, graduated cylinders, glass rods, tweezers, filter paper, fine wires, alum.

Operation】 1. Prepare small crystals In a beaker containing 100ml of water, add 10g of finely ground alum powder, and stir with distilled water at the same time to completely dissolve the crystals. Continue to heat to 80-90, filter while hot, and the filtrate flows into a beaker that has been washed and warmed with hot water, and the lid is allowed to stand. After a few hours or overnight, you will notice the formation of several small crystals at the bottom of the cup.

2. The growth of small crystals Pick a crystal with a relatively complete crystal shape, tie it with a thin wire, hang it in a beaker containing saturated alum solution, and cover it to stand. Add a small amount of slightly hot saturated alum solution to the beaker every day, and the small crystal will gradually grow into a large crystal.

1. Alum. Crystal. Target. Experiment.

Preparation. Take 50ml of 2mol·l-1

KOH solution, add 2g in multiple doses

Aluminum scrap. Goods.

Aluminum toothpaste shell, aluminum alloy.

Cans. etc.), after the reaction is completed, use a Brinell funnel. Suction filtration. Take.

Liquid. Dilute to l00 ml and add dropwise 3 with constant stirring

mol·l-1

H2SO4 solution (Press.

Chemistry. Reactive metering). Heat until the pellet is completely dissolved, and concentrate the solution appropriately, then use.

Tap water. Cooling.

Crystallized. The resulting crystal is kal(SO4)2·12H2O.

2. Cultivation of transparent single crystals of alum.

kal(SO4)2·12H2O.

Regular octahedron. Crystal form.

In order to obtain a single crystal with intact edges and corners and transparent corners, it should be allowed.

Seed crystals. Seed.

There is enough time to grow, and the premise for the crystal seeds to grow is solution.

Concentration. in a state of appropriate supersaturation. This experiment will be done by willing.

Saturated solution. At.

Room temperature. Under the standstill, lean. Solvent. Target.

Nature. Volatilization creates a quasi-stable state of the solution, and the crystal seed is artificially injected to gradually grow into a single crystal.

Growth and selection of seed crystals.

According to KAL (SO4) 2·12H2O.

Solubility. Weigh l0g of homemade alum, add an appropriate amount of water, heat and dissolve, and then put it in a place that is not easy to vibrate, a beaker.

Mouth on the shelf one. Glass rods.

Then cover a piece over the beaker mouth.

Filter. Lest.

Dust. Drop, leave for a day, the bottom of the cup.

There will be small crystals precipitated, from which the complete crystalline crystals will be selected for later use, and the solution will be filtered for later use.

The growth of crystals (can be operated under class) Tie the seed crystals with a fine polyester thread for sewing, cut off the remaining heads, wrap them around the glass rod and hang them in a filtered saturated solution, and observe the slow growth of the crystals. After a few days, you can get large crystals with intact edges and corners, and crystal clear.

In the process of crystal growth, it should be observed frequently, and if small crystals are found to grow on the seed crystals, they should be removed in time. If there is crystal precipitation at the bottom of the cup, it should also be filtered out in time to avoid affecting the crystal growth.

Summary. Hello, alum crystal is synthetic, natural crystal is evolved from the natural environment.

Hello, alum crystal is synthetic, natural crystal is evolved from the natural environment.

Can you tell us more about that?

Alum crystal is a synthetic crystal like a liquid species, which is obtained by dissolving alum in hot water, and then soaking this solution in crystal slag modification clusters or crushed stone, and waiting for the solution to cool and crystallize. Natural crystal is a mineral crystal formed deep in the earth's crust, formed after millions of years of geological changes, with a higher energy frequency and lower flaws, so it is also higher. In addition, the color of alum crystal is more monotonous, while natural crystal has a rich color and shape, so it is also different in terms of use and collection.

Hope mine can help you.

The difference between alum crystal and natural crystal is mainly reflected in the following aspects:

1.The ingredients are different: Ming Zhaoyun alum crystal is an artificial crystal, the main component is aluminum sulfate potassium alum, while natural crystal is a natural crystal mineral, the main component is silicon dioxide.

2.Different color transparency: Alum crystal has better transparency, usually showing a bright crystal translucency, while natural crystal has better transparency than alum crystal, showing perfect transparency, which can form a positive and negative mirror effect.

3.Different hardness: the hardness of natural crystal is large, which is 7 grade of mineral hardness, and has high wear resistance and durability; Whereas, alum crystals have a lower hardness and are easy to scratch.

4.Pricing differences: Natural crystals are correspondingly more expensive because they are rare; Alum crystal, due to the cost of raw materials and the mastery of manual production, its ** is generally more close to the people and relatively cheap.

5.Difference in energy attributes: Due to the difference in composition of the two and the energy contribution of the earth gods of natural crystals, natural crystals, while maintaining their natural characteristics, have more distinct energy attributes, so in the process of use, they have better support and stimulation effects on related spiritual themes.

In summary, this reputation alum crystal and natural crystal are different in terms of composition, color transparency, hardness, pricing and energy attributes, etc., and you need to consider your own needs and budget when buying to choose.