If you order your cheap custom essays from our custom writing service you will receive a perfectly written assignment on Disturbing Equiliuim. What we need from you is to provide us with your detailed paper instructions for our experienced writers to follow all of your specific writing requirements. Specify your order details, state the exact number of pages required and our custom writing professionals will deliver the best quality Disturbing Equiliuim paper right on time. Out staff of freelance writers includes over 120 experts proficient in Disturbing Equiliuim, therefore you can rest assured that your assignment will be handled by only top rated specialists. Order your Disturbing Equiliuim paper at affordable prices! Experiment 6
Disturbing Equiliium
Aim To observe the effect of a change in conditions on a system at equiliium and explain the effects observed through Le Châteliers principle.
Equipment5 medium test tubes
1 test-tube rack
1 100-mL beaker
1 50mL beaker
1 dropper pipet
1 spatula
1 50-mL graduated cylinder
1 white card, to record
Materials
Saturated potassium nitrate solution, KNO
0.1 M Iron (III) chloride, FeCl
0.1 M Potassium thiocyanate, KSCN
Potassium chloride crystals, KCl
Potassium nitrate crystals, KNO
Ice
Distilled water
Procedure
Part A. Effect of Temperature on a Physical Equiliium
1. Add - mL of saturated potassium nitrate solution to a clean test tube. Using a spatula, add one crystal of potassium nitrate to the solution to act as a seed crystal.
. Cool the test tube in a 50mL beaker of ice for 10 minutes. Record results.
. Remove the test tube from the ice water and place it in the test-tube rack. Record what happens as the solution warms to room temperature.
Part B. Common Ion Effect on a Chemical Equiliium
4. Use a graduated cylinder to add 50 mL of distilled water to a 100 mL beaker. Add 1 mL of 0.1M iron (III) chloride and 1mL of potassium thiocyanate to the water; stir.
5. Label four identical, dry test tubes. Pour 5 mL of the mixture from step 4 into each. Hold the tubes over a white background and look down into them and they should appear equally dark.
6. Tube 1 is the control in this experiment. To tube , add 0 drops of 0.1M iron (III) chloride. To tube , add 0 drops of 0.1M potassium thiocyanate. Flick each tube to mix the solutions. To tube 4, add 1g of potassium chloride crystals. Flick the tube to dissolve the crystals. Compare the colours of the solutions in tubes , and 4 with the colour of the solution in the control tube (tube 1). Record your observations.
Results/Observations
System Observation
KNO (sat.) (cooled) Turned to ice crystals , forming up the tube.
KNO (sat.)
(warmed) Decomposed to ice flakes, a small amount of liquid.
Fe+/SCN- reaction Red concentration, (Control test tube).
Fe+/SCN-
Mixture + additional Fe+ Slightly darker from the control test tube.
Fe+/SCN-
Mixture + additional SCN- Significantly darker from the control test tube.
Fe+/SCN-
Mixture + KCl(s) Lighter from the control test tube. Almost orange
Conclusion
1. Write a balanced equation for the equiliium that existed before the saturated potassium nitrate was cooled.
KNO + KNO
. Did lowering the temperature (step ) affect the equiliium? Explain your answer.
Lowering the temperature does effect the equiliium, because this disrupts the balance and therefore has to make adjustments needed to restore the equiliium. This reaction is an exothermic reaction, because when the temperature is reduced it releases heat and the equiliium shifts and favours the products.
. Did increasing the temperature (step ) disturb the equiliium? What evidence do you have for your answer?
Increasing the temperature does effect the equiliium. The equiliium favours the side that absorbs heat, in this case the reactants. Evidence shows when increasing the temperature, the ice crystals decomposed and were less dense and liquid was visible. This exothermic reaction disrupted the balance of the equiliium and shifted to balance the stress of the system.
4. Explain what happened in the potassium nitrate system in terms of Le Châteliers principle.
The Le Châteliers principle states if a stress is applied to a system in a dynamic equiliium, the system changes to relieve the stress. In reducing and increasing the temperature in the potassium nitrate solution, this is applied stress to the equiliium. The equiliium relieves this stress by shifting to favour a side, to readjust and balance the reaction.
5. Write a balanced equation for the equiliium that existed after the ferric and thiocyanate were combined in the beaker.
FeCl + KSCN FeSCN + KCl
6. What evidence was there that the equiliium shifted when iron (III) chloride was added? In which direction did it shift?
The evidence shown that the equiliium adjusted, was the change in colour. This concentration changed colour slightly from the controlled test tube (tube 1). This displayed, that when iron (III) chloride concentration was added the equiliium shifted to favour the products. Iron (III) chloride is a reactant and adding more of this concentration produces more of the products.
7. What evidence was there that the equiliium shifted when potassium thiocyanate was added? In which direction did it shift?
The evidence also shown that the equiliium adjusted, was the change in colour. This concentration changed colour significantly from the controlled test tube (tube 1). The controlled test tube was a red colour and changed to a very deep red. This displayed, when potassium thiocyanate concentration was added the equiliium shifted to favour the products.
8. Explain the effect of adding potassium chloride to the system.
The effect of adding potassium chloride is that the equiliium will have to adjust to the stress of the added concentration. The equiliium will shift to favour the reactants. Adding the potassium chloride changes the colour and this indicates the equiliium has shifted to balance the stress of the system.
. Explain the changes observed in the Ferrothiocyanate ion system in terms of Le Châteliers principle.
The changes involved in the system was the large amount of colour change due to the added concentrations. In tube 1 was the control of the experiment, with the colour a red. In tube the colour went slightly darker when the iron (III) chloride was added. In tube the colour of this concentration changed significantly darker, and tube 4 changed lighter. The Ferrothiocyanate solution has this applied stress of the added concentrations. This disrupts the balance of the equiliium and the equiliium relieves this stress by re-adjusting and favouring a side to balance the reaction to reach dynamic equiliium.
Please note that this sample paper on Disturbing Equiliuim is for your review only. In order to eliminate any of the plagiarism issues, it is highly recommended that you do not use it for you own writing purposes. In case you experience difficulties with writing a well structured and accurately composed paper on Disturbing Equiliuim, we are here to assist you. Your cheap research papers on Disturbing Equiliuim will be written from scratch, so you do not have to worry about its originality. Order your authentic assignment and you will be amazed at how easy it is to complete a quality custom paper within the shortest time possible!