Equilibrium is a state of dynamic balance where the ratio of the product and reactant concentrations is constant.

The larger the equilibrium constant, the further the equilibrium lies toward the products.

**Formula to calculate equilibrium concentration.**

To calculate this, we use the ICE table.

I | y | 0 | 0 |

C | -x | +x | +x |

E | y – x | x | x |

**Example:**

Calculate the equilibrium concentration of the acid if the concentration of H+ in the following equation is 0.00005 if it is a 3M acid.

HCIO **⇌** H+ + CIO

HCIO | H+ | CIO | |

I | 3 | 0 | 0 |

C | – 0.00005 | 0.00005 | 0.00005 |

E | 3 – 0.00005 | 0.00005 | 0.00005 |

Therefore, the concentration of the acid is 2.99995.