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Le Chatelier Lab

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Introduction

Le Chatelier's Principle Laboratory Results Procedure A: Teacher Demonstration Reaction: 2NO2 (g) <----> N2O4 Red Brown Colourless - The colour of the gas in the gas syringe is light brown - When the pressure is increased in the Gas Syringe, the colour gets darker and then gradually fades back to the initial colour (light brown) to re-establish equilibrium. - When the pressure is decreased in the Gas Syringe, the colour gets lighter and then gradually darkens back to the initial colour (light brown) to re-establish equilibrium. Procedure B: Reaction: FeCl3 (aq) + 3KSCN (aq) <----> Fe(SCN)3 (aq) + 3KCl (aq) Yellow colourless orange colourless Well Instructions Observations A1 Place 10 drops of 0.001 mol dm-3 FeCl3 Clear Colurless Solution (No Change) B1 a) Place 10 drops of 0.001 mol dm-3 FeCl3 b) Add 10 drops of KSCN a) Clear Colurless Solution (No Change) ...read more.

Middle

C1 a) Place 10 drops of K2CrO4 b) Add HCl until a change occurs a) Bright Yellow (No Change) b) Turns to Light Orange D1 a) Place 10 drops of K2Cr2O7 b) Add NaOH until a change occurs a) Orange (No Change) b) Turns to Bright Yellow Procedure C: Reaction: Co2+ (aq) <----> Co3+ endothermic reaction (+?H) Pink blue 2. The colour is Light Pink 3. when the solution is heated, this heat is treated as a product, thus the reaction moves towards the left to establish equilibrium. Purple is a colour between Pink and Blue, and when the solution is heated the colour changes to purple Co2+ (aq) <----> Co3+ endothermic reaction (+?H) Pink Purple *at equilibrium* Blue 4. When the solution is cooled down in an ice bath, the heat is lost and so the colour goes back to pink. ...read more.

Conclusion

The progress of the experiment went smoothly and clear observations were collected. However, there were few limitations associated with the carrying out of the lab that can be either avoided or reduced in order for the experiment to be done easier. One limitation was the fact that the colors weren't very clear, and it is hard for human eyes to distinguish between for example, light orange and dark yellow, and with only 10 drops of the solution, the color would not be clear enough to determine. This definitely will affect the observations negatively; because each colour stands for a specific species, if light orange was mistaken for dark yellow, then the observation of each species would be wrong; thus having wrong observations, means that the experiment was unsuccessful. One realistic solution would be to have a bigger well, so that more amount of each species is used thus making the change clear enough. In general, apart from those limitations the experiment was very successful. ?? ?? ?? ?? Ammar Yasser IB Chemistry Mr Hennard Grade 12 ...read more.

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