Flame Reaction Experiment of Na Salt
The flame reaction of the salt should not be difficult to do, but it was actually more troublesome because the flame color of the salt was yellow, and the flame of the alcohol lamp was mostly yellow due to the unclean wick of the lamp and the impure alcohol. Even if the flame was almost colorless (light blue), when a new iron wire (or a nickel-based wire, platinum-based wire) was placed on the outer flame, the flame would still be yellow at the beginning. It was difficult to tell whether the flame color was the color of the original alcohol lamp or the color of the salt ion. To clearly see the yellow flame of Na, you can use the following method: 1. Forceps-cotton-alcohol method: Take a small ball of cotton (cotton wool) with a pair of tweezers and absorb a little alcohol (95% alcohol). Squeeze the alcohol on the cotton dry, then dip the cotton in some salt or waterless soda powder (grind it into fine powder) and ignite it. 2. Iron wire method: - He took a thin iron wire, wiped one end with sandpaper, and burned it on the flame of the alcohol lamp until there was no yellow flame. - Dip the end of the wire in water and then dip it in some salt or powder of the Na2CO3. - Light up a new spirit lamp (the wick of the lamp is clean and the spirit is pure). - The iron wire dipped in the powder of the salt was placed on the tip of the outer flame to burn. At this time, there was a small yellow flame on the tip of the outer flame, which was the salt flame. For students 'experiments, since most alcohol lamps were not clean, it was difficult to see the tip of the flame. Instead, a steel wire stained with salt could be placed in any part of the outer flame where there was a blue flame to burn. If the yellow flame covered the blue flame, it could be considered that the yellow flame was the salt flame. Read more exciting novels for free
Flame reaction experiment of chemical iron
There was no flame reaction on iron, or the frequency of the photon emitted by the iron after being excited had fallen outside the visible light, so the flame reaction experiment on iron could not be carried out. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>
The Essence of the Reaction of Salt and Salt
氯化铵与氢氧化镁反应的实质可从以下方面分析。氯化铵是强酸弱碱盐，在水中发生水解产生氢离子，即\(NH_{4}^{+}+H_{2}O = NH_{3}\cdot H_{2}O + H^{+}\)。氢氧化镁难溶于水，但氢离子能与氢氧化镁中的氢氧根离子反应，即\(Mg(OH)_{2}+2H^{+}=Mg^{2 + }+2H_{2}O\)，从而促使氢氧化镁溶解。 从另一个角度看，这一反应也可理解为氢氧化镁沉淀能溶解于铵盐中。因为铵盐（如氯化铵）存在时，铵根离子与氢氧根离子结合，使氢氧根离子浓度降低，例如\(MgCl_{2}+2NH_{4}OH \rightleftharpoons 2NH_{4}Cl + Mg(OH)_{2}\downarrow\)这个可逆反应，当氯化铵大量存在时，平衡向左移动，沉淀溶解。此外，该反应也有气体生成推动反应进行的因素。 <a href="/?from=ask_words" style="color:red" target="_blank">点击前往免费阅读更多精彩小说</a>
The reaction base in the paper purification experiment is
In the paper column experiment, if it was a paper column experiment for the separation and identification of an ammo acid, the reaction substance could be a mixture of 0.5% lysine, praline, and Leucine (the concentration of each component was 0.5%), etc. However, paper biochemistry experiments could be used to separate and identify a variety of substances, and the reaction substances were different for different experimental purposes. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>
What is the reaction of sprinkling salt on ants?
Salt was sprinkled on the ants. After eating salt, the ants would easily die of dehydration. This was because the salt had a certain effect on ants. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>
How to distinguish the flame reaction
The flame reaction was a reaction in which certain metals or their compounds caused the flame to show a special color when burned in a colorless flame. It could be distinguished by observing the color of the flame. The flame reaction colors of common metals were: Na yellow, Li purple, K purple, rubidium light purple, calcium brick, Stronghold red, copper green, Ba yellow green. When conducting a flame reaction experiment, a clean platinum wire (or iron wire) was usually used to burn the flame outside the alcohol lamp until the color was the same as before (to prevent impurities on the platinum wire from interfering with the test). Then, the metal wire was dipped in the solution to be tested and burned to observe the color of the flame. Because of the possible use of Na in the production of potash, the solution of potash ions often contained Na ions, and the flame reaction of Na was yellow, which was difficult to distinguish from a small amount of purple. Therefore, when observing the flame color of potash, it was necessary to observe it through a blue-colored glass to eliminate the interference of the flame color of Na. In chemistry, the flame reaction was often used to identify whether a certain metal existed in a compound, such as identifying a solution of NaCl2 and a solution of KCl2. The flame color was yellow for the NaCl2 solution, and the flame color was purple for the KCl2 solution. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>
Determination of Phosphorus in Flame Reaction
The flame reaction test for the determination of the potassium ion mainly had the following steps: First, the platinum wire was dipped in concentrated sulfuric acid and burned on a colorless flame until it was colorless. Then, the sample was dipped in the colorless flame and burned. Then, the color of the flame was observed through the blue Cobalt Glass. If the flame was purple, it meant that the sample contained the potassium ion. Otherwise, it did not. After the experiment, the platinum wire was dipped in concentrated sulfuric acid and burned until it was colorless. In the flame reaction, because the yellow color of the Na flame might cover up the color of the K flame, it had to be observed with blue Cobalt Glass. This method originated from Bunsen's experiment. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>
What is the reaction of 2-Bromobutan and Na-methyol?
The reaction of 2 -Bromobutan with Na methylol would result in an elimination reaction to form alkene. Because of the strong base, the combination ability of 2-methylethylane and the strong bond ability with the hydrogen atom, and the carbon atom in 2 -Bromobutan that was connected to the nitrogen atom was not as electronegative as the nitrogen atom, it was positively charged. Due to the induction effect, the adjacent carbon atom was also positively charged. The carbon atom further transferred the positive charge to the connected hydrogen atom, causing it to become a hydrogen ion. The 2 -Bromobutan was acidic and provided the hydrogen ion. This reaction was actually an alkali-base neutralizing reaction, and the reaction products were alkene, hydrogen, and alcohol. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>
Reaction of Na_4H_4 and Phen_2-Aldol
The reaction of the two reagents will produce methylethylalcohol. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>
Reaction of lead nitrates with Na2S04
The reaction of lead nitrates (Lead (NO) Ü and Na Ü SOÜ will produce lead sulfuric acid (PbSOÜ) precipitations and a solution of NaNO. The reaction equation is: Lead (NO) Ü + Na SOÜ = PbSOÜ + 2NaNO. The reaction phenomenon was the formation of a white deposit, which was due to the white deposit of lead sulfuric acid. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>
What is the reaction between Na and gasoline?
Sulfur does not react with gasoline. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>