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When do you use this? You use Keq to find the concentration of a reversible reaction at equilibrium. You use Q to find the concentration of a reversible.

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Pick up the notes. Get out your homework handouts. DO NOW

Sometimes, you are given Keq and all but one of the concentrations Sometimes, you are given Keq and all but one of the concentrations. This is called finding the “missing species” – the missing concentration. MISSING SPECIES

SOLVING FOR MISSING SPECIES What is the concentration of H2 for the following reaction if the final concentrations are I2 = 0.300M, HI = 0.600M , and Keq = 0.255 I2 + H2  2HI Keq You have to rearrange the equation to solve for [H2]. SOLVING FOR MISSING SPECIES

WHAT YOU CAN DO… You can now do the following: 1. Write an equilibrium expression for any equation. Solve for Keq if given the EQ concentrations. 3. Solve for a missing species if given Keq and all but one EQ concentration. WHAT YOU CAN DO…

TO DO The Keq Review Practice is due TODAY. The Study Guide is due tomorrow. TO DO