What should you not do when you are writing an expression for the equilibrium?

There are a lot of things that you should not do. Some of these things include:

• Adding/Subtracting an item from one side without doing the same to the other side
• Forget key notations (like "aqueous" or ions)
• Confuse elements by writing in the wrong case, e.g. NB does not equal Nb.
• Perform any non-chemistry work at the same time.