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In Fajan'$ method what is the function of dextrin? (LpointlWhy you use ImL of indicator not for example 3-4 drops of indicator? (LpointlWrite all the chemical ...

Question

In Fajan'$ method what is the function of dextrin? (LpointlWhy you use ImL of indicator not for example 3-4 drops of indicator? (LpointlWrite all the chemical equations for the adsorption indicator Fl- with AgCl precipitate: (ZpointshIn Volhard's method what is the function of adding nitro benzene and HNOz? (2points}

In Fajan'$ method what is the function of dextrin? (Lpointl Why you use ImL of indicator not for example 3-4 drops of indicator? (Lpointl Write all the chemical equations for the adsorption indicator Fl- with AgCl precipitate: (Zpointsh In Volhard's method what is the function of adding nitro benzene and HNOz? (2points}



Answers

Describe how an indicator works. Use a chemical equation in your explanation.

So now we're going to work on problem 40 from chapter 13. This problem, we're told a lot of information about silver nitrate. Um, especially about its use in forensic science is so in this use, it forms. Ah, as possible. The former precipitate of silver chloride to detects when and so we have some, uh, parameters given for silver in a tree in solution. So the delta for lattice the double edge of hydration. And we want to calculate the delta age of solution so that really the relationship that relates all of these problems. All of these values is that the Delta H of solution equals the delta h of the lattice. Let's make the lot of smaller plus the delta h of hydration. So the delta h of the lattices 822 cathedrals promote and four hydration is negative. 7 99 uh, collaterals promote. So we have 822 minus 7 99 this gives us in Delta H of solution of 23. Kill the drills. Permal

So here, first of all we have are uh dissociation reaction were silver chloride, which isn't very soluble, dissociates slightly to A G plus in Cool, right. And we're also adding ammonia. This reaction, So the relevant thing with pneumonia is that a G plus will react with two ammonia to form a complex science. So, since there is a formation of the complex I am, there is a decrease in the concentration of A G plus. And as a result of this decrease in concentration, the system will shift in the direction. To minimize this decrease in concentration, which is the basis of like Cialis principle. So more gcl would have to dissolve and the reaction would shift to the right and result in a solid ability increase. So more silver chloride would dissolve. However, when we're adding more and more Ammonia A Channel three, we see that the solid ability of a VCR or decrease. So the main reason why for essentially this reaction occurring is the fact that ammonia can react with hydrogen two hydrogen ions to form ammonia. So there will be a decrease in the concentration of essentially are ammonia molecule. So technically the more of the complex ion would lead to the re formation of ammonia, and A G plus. An increase of the concentration of a. D. Plus would result in the system going back to forming war silver chloride. And these are main principles.

Mhm. It's crucial that acid based indicators are acids and bases themselves so that their color can be affected or changed by the ph of the solution. If they were not acids or bases themselves they would not be affected by ph. Here's an equilibrium reaction showing an indicator that is protein ated reacting with water producing the deep rotated form of the indicator. And hydro nia my on based upon lady chatterley's principle, if we increase or decrease the hydro knee um concentration then we can increase or decrease the amount of the I. N. Minus and the H. I. N. Dependent upon the direction of shift, increasing the hydro knee. Um concentration shifts it more to H. I. N. Decreasing the hydro knee. Um concentration shifts that more to I. N minus. So it serves as an indicator because the protein ated form is of a different color than the deep rotated form. The acid base indicators then are acids themselves with their own K. Values which describe their own equilibrium. So they will change color, or they will cause the solution to change color as the equilibrium shifts and the relative amounts of the protein ated and deep rotated form occur in solution at a particular ph we might see a transition from a red color to a blue color, and we hope that that transition corresponds to the ph at the equivalence point for the other acid that we are tight trading, so we don't want to use large amounts of the indicator because they will add to if the thai Trent is the base, the amount of thai Trent that we need to add in order to reach the end point.

For a part a let's write the balanced chemical equation. We're going to start with silver nitrate solution which reacts with a calcium chloride solution so. Mhm. To produce a precipitate of silver chloride and calcium nitrate. Yeah. To balance we needed to in front of the silver nitrate And a two in front of the gcl the part beach explain why this reaction goes to completion. So the precipitate results yeah. In removing ions from the solution. Yeah. Okay. And the strong attraction yeah. Between Catalans and an ions. Yeah. Mhm. Promotes precipitation. Yeah. Yeah. In this reaction. Yeah. Yeah. Mhm. The strong force of attraction. Mhm. Yeah. Mhm. Between the Ackroyd irons. Mhm. Yeah. Yeah. Yeah. Yeah. And e silver plus science come drives the reaction to completion. Mhm. Mhm. As it separates out from solution. Yeah. Yeah. Yeah. Mhm. Yeah. Mhm. Yeah.


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