- Part Iii The Color Of Cobalt Procedure Color Of Cocl2 Solid Color Of Cocl2 In Ethanol 1 1 8 9 Write The Equilibri 1 (173.05 KiB) Viewed 11 times
- Part Iii The Color Of Cobalt Procedure Color Of Cocl2 Solid Color Of Cocl2 In Ethanol 1 1 8 9 Write The Equilibri 2 (156.79 KiB) Viewed 11 times
Part III: The Color of Cobalt Procedure Color of CoCl2 solid Color of CoCl2 in ethanol # #1 #1 #8 #9 Write the equilibrium reaction: See background section #2 Color after added H₂O #2 #2 #3 #3 #3 #6 #7 #7 #8 Write the equilibrium constant expression for the reaction above. What is the pred@obalte species in this solution now? Color after HCl added Which side: reactants or products, is favored this equilibrium? (reaction written above) Why did this happen? (Le Châtelier's reason) Lab Observations park fuscha, dark pink Dark blue Blue Pink 2 [COC14] ²cag) + 6H₂0(₁) => [cin((+4₂0) 6 ] ²(aq) + ACT@= Light Pink Heat Color? Where in the equilibrium does the hot solution lie? Products of reactants? Cold-Color? Where in the equilibrium does the cold solution lie? Products of reactants? Is the cobalt (II) chloride/H₂O reaction (as written above) exothermic or endothermic? Give justification. Acetone added- Where in the equilibrium is the reaction! Give a Le Châtelier's justification. Explain what happened above, and why? Purpulesh color blue blue Color: park blue blue marcon color + Royal AgNO3 added- Where in the Light blue with precipitate. equilibrium does the reaction now lie? What happened to produce the change? Light Purple 111
For all observations and explanations, we are looking for how the change you saw is related equilibrium under investigation based on Le Châtelier's Principle (that is the name of the lab). Simply writing that the equilibrium shifted will get you a zero; explaining in which direction the equilibrium shifted and why (Le Châtelier's Principle) will earn you full points-you should refer to the background for the reactions you have to write for each equilibrium. Explanations should be done in just a few simple sentences which indicate: which species in the reaction equation increased/decreased, why, and in which direction wi the equilibrium shift because of this. Such as: The solution turned from orange to green. Green Orange CH3COOH + H₂O CH3COO + H3O+ The addition of hydronium ions increased their concentration on the product side of the equilibrium, and this caused the equilibrium to shift toward the reactants side. This shift turned the solution to the green color. Remember, you must indicate which ion INCREASED/DECREASED, why it changed (based on either a chemical reaction with what was added, simple INCREASE or DECREASE of an ion or molecule, or whethe. not the reaction was endothermic or exothermic), and how the equilibrium shifted off-set this change! Simply stating that the reaction shifted to products or reactants will lose you points!! If you don't have what ion increased or decreased, why it increased or decreased, and how that caused the equilibrium to shift, YOU WILL LOSE POINTS. This is the easiest lab of the term, if answer things correctly. REMEMBER, state WHY something happened not just that it happened!!