To make an ICE table for finding out how much of a substance is present at equilibrium, follow these simple steps:

1. Identify the Reaction: First, write down the balanced chemical equation. This shows what happens in the reaction.

2. Set up the Table: Create a table with three rows. Label them: Initial (I), Change (C), and Equilibrium (E).

3. Initial Concentrations: In the I row, write down the starting amounts of all the substances involved in the reaction.

4. Change in Concentrations: In the C row, show how much these amounts will change. You can use letters like $-x$ or $+y$ to represent these changes.

5. Equilibrium Concentrations: In the E row, combine the I and C values to find out how much of each substance is present at equilibrium.

6. Solve for x: Use the equilibrium expression to find the value of $x$. This step involves some calculations.

7. Final Concentrations: Finally, plug $x$ back into the equations to find the final amounts of each substance in the reaction.

By following these steps, you can easily find the concentration of substances at equilibrium!