# How do you calculate Keq from equilibrium constants?

Sep 12, 2017

For the equilibrium reaction.....$A + B r i g h t \le f t h a r p \infty n s C + D$

#### Explanation:

${K}_{\text{eq}} = \frac{\left[C\right] \left[D\right]}{\left[A\right] \left[B\right]}$

See here for a more formal treatment. As always, equilibrium means equality of forward and reverse rates of reaction, NOT cessation of chemical change.