-
Warm. Reagent.
1.Water (freshly boiled to room temperature).
2.Methyl orange.
Solution. 3.Neutral glycerol.
4.Hydrochloric acid titration solution (
5.Methyl red-bromocresol green mixed indicator.
6.Benchmark anhydrous sodium carbonate.
7.Sodium hydroxide.
Titration solution (8.)Phenolphthalein.
Indicator solution. 9.Benchmark potassium hydrogen phthalate.
Physicochemical properties. Industrially, borax is generally written as Na2B4O7·10H2O, but its molecular formula is Na2B4O5(OH)4·8H2O. Anion.
The structure is made up of two BO4 tetrahedrons.
and two BO3 units, i.e., tetraborate ions.
Colorless translucent crystals or white crystalline powder. Odorless and salty. Lose all of the crystal water when you are specific to your specific gravity.
Soluble in water and glycerin, slightly soluble in alcohol. The aqueous solution is strongly alkaline. Borax can be slowly weathered in air.
When melted, it becomes a colorless glass-like substance, and the metal oxide is dissolved in the melt, each showing a characteristic color, and is used as a borax bead test in qualitative analysis
Na2B4O7+COO=2NaBo2+CO(Bo2)2 (blue gemstone) can be used to identify metal ions.
Borax has a bactericidal effect and is harmful to people when taken orally.
Chinese name: borax, sodium tetraborate.
Ten water), moonstone sand, yellow moonsand.
Borax (medicinal), sodium tetraborate decahydrate, moonstone sand, sodium tetraborate.
Product Name: borax,sodium tetraborate,decahydrate,sodium borate, decahydrate,antipyonin,borascu
Toxic LD50 (mg kg): rat oral 5660.
-
It can be dissolved, and it is better to dissolve it at a higher temperature.
Borax, or sodium tetraborate, has the molecular formula and is a very important boron-containing mineral and boron compound. It is usually a white powder containing colorless crystals that is easily soluble in water.
Borax has a wide range of uses, from cleaning agents, cosmetics, pesticides, to buffer solutions and other boron compounds.
Colorless translucent crystals or white crystalline powder. Odorless and salty. Lose all of the crystal water when you are specific to your specific gravity.
Soluble in water and glycerin, slightly soluble in alcohol. The aqueous solution is weakly alkaline. Borax can be slowly weathered in air.
When melted, it becomes a colorless glass-like substance. Borax has a bactericidal effect and is harmful to people when taken orally.
Boiling Point: 1575
Melting Point: about 880
Chinese name: borax, sodium tetraborate (decahydrate), moonstone sand, yellow moonsand, borax (medicinal) sodium tetraborate decahydrate, moonstone sand, sodium tetraborate.
Product Name: borax,sodium tetraborate,decahydrate,sodium borate, decahydrate,antipyonin,borascu
-
Yes, the temperature is high, and the solubility is high, too.
10 g 100 g water.
50 water.
100 water.
-
Rinse with hot water and apply cold.
-
Borax, commonly written as Na2B4O7·10H2O, is a very important boron-containing mineral and boron compound. It is usually a white powder containing colorless crystals that is easily soluble in water. Borax dissolved in water is borax water.
Lotus root flour, mung bean starch, potato starch, corn starch and sweet potato starch can be mixed with water to replace borax water; There are also baking soda, laundry detergent water, crystal muddy water, soapy water, etc. can replace borax water.
-
Borax is sold in pharmacies. After mixing with water, it is borax water.
-
Borax is used as an insurance preservative in the food industry (appropriate addition is allowed), and laundry detergent water, potato starch, corn starch, sweet potato starch, and lotus root powder can replace borax water.
It is important to remember that borax and its substitutes are not to be used as food or flour additives. Generally, it is mainly used externally, and it must be taken with special caution if it is taken internally. People with weak constitutions are forbidden to take borax.
-
The way to prepare borax water is very simple. According to the required use, according to the required proportion, sodium borate can be prepared by dissolving it directly in water.
Let's take a simple example. The literature shows that the spraying concentration of borax 18 kg hm2 borax can maximize the unit yield, unit net income, and net increase to production ratio. If boric acid water is used for agricultural production as a fertilizer to supplement trace elements, 18kg of borax is needed for one hectare, and when configuring borax water, we dissolve 18kg of borax in 6L of water to prepare the solution and spray it on the land.
The role of borax water:
1. Treatment of sore throat: Pengsha and white plum are divided into equal parts. The pounding pills are large, and each pill is puffed.
2. Treatment of wind and heat throat paralysis, winding throat wind: one or two halves of flame nitrate, half two halves of borax, one word of brain, one point of white zombie silkworm. The top is the end of the grinding, with a bamboo pipe to blow half a penny into the throat.
3. Treatment of aphthous ulcers: Pengsha, Qingdai, borneol, mint, and gypsum (calcined) are divided into equal parts. The top is very fine, and a little is used to apply the mouth to the mouth.
4. Treatment of swollen tongue: good borax is fine, rub the swollen part of the tongue with a thin batch of ginger dipping medicine, and retreat when it is less.
5. Treatment of tooth shaking: one grass aconitum firm, one or two borax. The upper piece is finely minced, and each tooth is rubbed with a little.
Lion's mane mushroom. The cornstarch is soaked in warm water, so the lion's mane mushroom is very delicious, so be sure to soak it in warm water.
The best temperature is around 60 65.
Why it's not good to drink only boiled water.
One asks, why do you have to drink raw water? Why is it bad to drink boiled water? Because raw water, once boiled, is the same as distilled water. >>>More
I think that since the water is poured into another place, the same volume, the initial kinetic energy is enough for them to mix well, and the density difference between hot and cold water has little effect on the mixing in this case (in other cases, the density difference may dominate the mixing effect, for example, the initial state of two liquids is layered and stationary). So whether you pour hot water into cold water or cold water into hot water, there is no difference in the speed of cooling. In the above answer, when it comes to heat exchange with air and hot water cups, I just want to say that the heat exchange with air is negligible in such a short time of pouring water, and it is simply not an engineer to take the time to think about it. >>>More
It is best to use warm water, between 70 and 80, and after soaking, you can put it cold and add ice. Also, it's best to peel the lemon and bubble it. Method: >>>More