Chem112 Day 11.docx - Chemistry 112 – Day 11 Things to Remember o You don’t include pure solids or pure liquids in the equilibrium expression Why

Chem112 Day 11.docx - Chemistry 112 – Day 11 Things to...

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Chemistry 112 – Day 11 (10/02/19) Things to Remember o You don’t include pure solids or pure liquids in the equilibrium expression. Why? Because pure solids and pure liquids don’t have a concentration, they are literally just what they are. o For reactions that occur in the gas phase you often use K p . Instead of using concentration you use pressure o You can convert between K c and K p o K p = K c (RT) K p and K c will be equal if the mole number never changes. This equation can only be used if the moles stay the same. The letter Q o Q is the position of the reaction at any point We can compare Q to K to figure out which way the reaction is going to go. o H 2 S(g) H 2 (g) + S 2 (g) K = 1.67 x 10 -7 Initial Conc. H 2 S = 1.5M, H 2 (g) = 2.3M, S 2 (g) = 3.6M Which direction is the reaction going to go? ICE Tables o Learn it now and you will be able to apply it to a variety of problems in the next three chapters. Initial Change Equilibrium Quadratic Equation o x = b 2 4 ac 2 a o
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