Solids and Liquids in K

Part of the Energy, Rates and Equilibrium section of Coddy's Chemistry journey. Lesson 25 of 35.

Pure solids and liquids keep a constant concentration, so they are left out of K.

$\mathrm{CaCO_3(s)} \rightleftharpoons \mathrm{CaO(s)} + \mathrm{CO_2(g)} \qquad K = [\mathrm{CO_2}]$

Only (g) and (aq) appear. Read every state symbol.

Challenge

In a lime kiln, limestone breaks down: CaCO₃(s) ⇌ CaO(s) + CO₂(g). Build its equilibrium constant expression.

Try it yourself

EquilibriumWrite the equilibrium expression

CaCO₃(s)CaO(s)CO₂(g)

Test yourself

This lesson includes a short quiz. Start the lesson to answer it and track your progress.

All lessons in Energy, Rates and Equilibrium

1Energy in Reactions

4Rates of Reaction

7Practice Problems

2Bond Energies

5Equilibrium

3Changes of State

6Changing an Equilibrium