Excess reagent calculator
After reaction goes to completion, see how much of the non-limiting (excess) reactant remains.
Calculator
How to use
Excess reagent
Once ξ is known from the limiting reactant, the non-limiting reactant has
$$n_{\text{remaining}} = n_0 - \xi \times \text{coefficient}$$
When to use
- Lab planning: how much unreacted starting material remains.
- Checking whether a procedure used a true excess.
Educational use only. Double-check values for labs, homework, and exams.