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#Write down balanced chemical reaction #Determine and write down the Equilibrium Constant Expression (K={products}/{reactant} #Plug in known information and solve for unknown. ##Sometimes they give all equilibrium concentrations and look for Equilibrium constant (K). ##Sometime they give K and you are looking for one of the species' equilibrium concentration (they give all other species' equilibrium concentrations) ##Sometimes they give concentration of one reactant and/or product at equilibrium and all other species' initial concentrations and you are calculating K. **If this occurs, all you Wizards of Stoichiometry need to set-up ICE Box table. **i. Change mole and container of initial conditions into concentration (Molarity, M). **ii. Convert one piece of equilibrium to mole or M reacted. **iii. Take M reacted and use stoichiometry to determine amount of all other species reacted or producted in rxn **iv. Use math on table to determine equilibrium concentration of all species. |
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Step 1 : Write down balanced chemical reaction Step 2 : Determine and write down the Equilibrium Constant Expression (K=[products]E/[reactant]E) where E = Equilibrium conditions. Step 3: Plug in and do math to solve for unknown. (3 Levels of Difficulty) |
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Level 1 : Simplest Difficulty *Problems gives all equilibrium concentration and you are solving for K (would be nice to figure out units also). See example below. *Problem gives all equilibrium concentrations except one and gives value of K (you need to determine units of K) and solving for last equilibrium concentration., ([Example of Work for Simple Equilibrium Problems]. Remember, you need to manipulate the equation, in this case, equilibrium constant expression into a form with your unknown on one side of equal sign and all other variable on other side of equal sign. Level 2 : ICE Box without "x" (have one piece of information at equilibrium) *Direction on Calculation ICE Box without x Problems * For example of work, click here [Example of Work for a Simple ICE Box (no x)] Level 3 : ICE Box with "x" (will not do in 1st year, but will in AP Chem) |
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