Asked by kate
Which species are left out from the Keq expression, and why?
Answers
Answered by
GK
Solids, and liquids (pure or nearly pure). They are not really left out. They are assigned the value of "1" (one). Example:
CaCO3(s) <=> CaO(s) + CO2(g)
Keq=[CO2](1) / (1)
Keq = [CO2]
CaCO3(s) <=> CaO(s) + CO2(g)
Keq=[CO2](1) / (1)
Keq = [CO2]
Answered by
DrBob222
Solids are omitted. By definition they are in their standard state and have a concentration of 1. Water is often omitted but not always.
Answered by
DrBob222
Good. GK mentioned pure liquids.
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