What is the reaction phenomenon of the standard titrations of the two kinds of thionate?
When the standard solution was used to determine the concentration of the thionate, there was a large amount of I <2> in the initial reaction solution. If the starch indicator was added at this time, I <2> would be absorbed by the starch and it would be difficult for the starch to react with the thionate, making it difficult to observe the end point. Therefore, the starch had to be added when the solution was yellow-green. In the process of titrations, when brown iodines were formed and the starch turned blue, the bright green (the color of the tri-valent chromate ions formed by the reaction of chromate and Ki) was covered. The starch should be colorless after the blue faded, but the original bright green of the tri-valent chromate was presented as the background, so the end point was blue to bright green instead of colorless. In actual operation, when the solution was dripped with the solution of the starch indicator solution until it was yellowish-brown with a little green, the solution would turn dark green (and the solution would become turbid with some precipitations). If the solution continued to be titratable, it would turn blue, and finally the blue would become lighter (and the solution would become clear). Read more exciting novels for free
What are the requirements for the reaction of the titrations?
The requirements for the titrations were as follows: 1. There was a definite relationship between the two, and the reaction was carried out according to a certain reaction equation without any side reactions. 2. The reaction had to be carried out in a fixed amount, and the reaction was usually required to be at least 99.9% complete. 3. The reaction speed had to be fast. For slower reactions, it could be accelerated by heating, increasing the concentration of the reagents, adding a catalyst, and other measures. 4. There are appropriate methods to determine the end point of the titrations. 5. Coexisting substances do not interfere with the main reaction, or appropriate methods can be used to eliminate their interference. 6. If it was a complexititriation reaction, the resulting complex must have a certain composition, that is, the central ion and the coordinating agent must be combined strictly according to a certain ratio; the resulting complex must have sufficient stability; the reaction speed must be fast enough; there must be an appropriate indicator or other methods to reflect the arrival of the chemical point. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>
Reaction equation phenomenon and explanation of the phenomenon of the reaction equation of the reaction of the reaction
There is no chemical reaction between NaCl2 and magnesiumcarbonate2. In chemistry, the conditions for metathesis reactions to occur were the formation of precipitations, gases, or water. After mixing the two, the conditions for the metathesis reaction were not met, so there was no reaction, no reaction equation, and no reaction phenomenon. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>
Reaction equation of the addition of iron chloride to the solution of thionate
1. The combination of the hydrogen ion and the sodium-phenate to form the following: <C6H5O ^ -+H^+= C6H50H> 2. The color reaction of the reagent was: [(Fe^{3 +}+6C6H50H →(FeC6H5- O) 6)^{3 -}+6H^+]. Because it was a solution of iron dioxide, there were both iron ions and hydrogen ions, and the reaction between the two reacted to the above equation. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>
What's the reaction formula for titrating thionate with iodination?
2Na2S2O3+I2═Na2S4O6+2NaI。 <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>
The reaction phenomenon of the reaction of nitrates and the reaction of the reaction of the nitrates and the sodiums
The reaction between the acid and the acid would result in the formation of a sulfuric acid deposit. The reaction equation was Na Chi SiOx +2HNOOx == H Chi SiOx +2NaNOOx, and the reaction phenomenon was the formation of a white deposit. In this reaction, the sulfuric acid did not show any oxidisation, but only showed its acidic nature. This was because the silicon in the silica was already in the highest state, and the acidic nature of the sulfuric acid was stronger than that of the sulfuric acid, which was in line with the principle of making a weak acid from a strong acid. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>
Reaction phenomenon of the reaction between the two substances
The reaction of the two reagents would produce a light green deposit (nickelous carbonite) and then a solution of the two reagents. However, if the test tube was shaken, the deposit would dissolve, regardless of the amount of the reagent. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>
Reaction equation phenomenon and phenomenon analysis of NaCl2-magnesite
There is no chemical reaction between the two of them. In terms of chemical principles, the conditions for the metathesis reaction to occur were the formation of precipitations, gases, or water. The mixture of the two did not meet the conditions for the metathesis reaction to occur, so there would be no reaction. Therefore, there was no reaction equation, reaction phenomenon, and phenomenon analysis. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>
The reaction phenomenon of the reaction of the sodic acid to the sodic acid
The reaction between the two was the reaction between the two, and the equation was: [2Na_{2} O_{2}+2H_2} O = 4NaOx + O_{2}^. The reaction phenomenon was that a large number of bubbles were produced, and the gas produced could reignite the wooden strips with sparks. The temperature of the test tube wall increased, and the solution first turned red and then faded (if the phenylethylene was added to the water in advance). This was because the reaction generated oxygen and released a lot of heat. The resulting soda ash turned the phenylethanes red, but the soda dioxide was oxidisable and would cause the red solution to fade. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>
The difference between back-titrations and back-titrations
There was no such thing as 'reverse titration', so there was no difference between the two. The back-titrations were mainly used when the reaction speed was slow or the reagent was a solid. After adding the standard titrating solution that met the measurement relationship, the reaction could not be completed immediately. For example, when there was a lack of indicators that met the requirements, the measured ions had a blocking effect on the indicator, the coordination speed of the measured ions with the ADC was very slow, and the measured ions had side reactions such as dehydration that affected the measurement, the back-titrations could be used. The specific operation was to first add a certain amount of excess titrant to accelerate the reaction. After the reaction was completed, another standard solution was used to titrate the remaining titrant. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>
Reaction Formula and Phenomenon of Styrene and Polyethersulphone
Styrene ($C8H8 $) and Polyethersulphone (which had a complex structure and was briefly recorded as PES. Its molecular chain contained functional groups such as ether bonds and sulphone groups) were generally difficult to directly carry out simple reactions. Under certain conditions, such as complex organic reaction mechanisms such as free radical initiation, it may occur. However, this was a complicated process, and a simple and schematical reaction equation (assuming that a apped reaction occurred) might be as follows (it was only a schematics, the actual reaction was much more complicated): $nC8H8 + mPES/stacking {initiator and other conditions}{long right arrow}$Poly (complex structure, it is difficult to accurately write the specific structure here) Phenomena: If the reaction is carried out in a solution system, as the reaction goes on, the solution may change in terms of the initial low density. This is due to the formation of a larger molecular weight of the initiator. If there is a thermal change in the reaction, there may be a temperature increase or external temperature control may be needed to maintain the reaction temperature. Moreover, the reaction system might change from the initial uniform and transparent state to turbid as the reaction progressed or the product was separated. However, this depended on the specific reaction conditions and the composition of the system. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>