Calculating the Equilibrium Constant
An ICE table — Initial, Change, Equilibrium — organizes a K calculation. Fill in the initial concentrations, express the changes in the coefficient ratio (using a variable), and add to get the equilibrium row. Then compute K from the equilibrium concentrations.
The traps read K off the initial row (K uses equilibrium values), mishandle the change row (the changes follow the stoichiometry and have signs), or treat the variable x as the final answer rather than substituting it back. Build the equilibrium row, then calculate K.
The work
3 ways in · any order
Lesson
Calculating K
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An ICE table builds the equilibrium row from initial plus change (in the coefficient ratio), and K comes from that row. The lesson works the table, then closes with a ten-scenario check.
Diagnostic
10-item topic check
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Ten items spanning the Topic 7.4 misconceptions: quotient built wrong, K read off the initial row, the ICE change row mishandled, and x misread as the final answer.
Targeted Practice
Drill a single misconception
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Pick one of the failure modes you missed and drill it on its own. The round is adaptive: two correct in a row clears the misconception and moves you to the next.