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Heterogeneous Equilibrium
Concepts tested here
- Pure solids omitted from K
All Questions
2000 AIPMT 1 question
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Equilibrium constant $K_p$ for following reaction : $MgCO_3(s) \rightleftharpoons MgO(s) + CO_2(g)$For a heterogeneous equilibrium, pure solids (and pure liquids) have constant activity (taken as 1), so they are not included in the equilibrium expression.
Here $MgCO_3$ and MgO are solids, so only $CO_2$ appears:
$K_p = P_{CO_2}$