Calculadora de Equação Iônica Líquida
- Created by
- Renato Passos, Eng. de Software
- Reviewed by
- Renato Passos, Eng. de Software
Last updated: Apr 18, 2026
Formula
Σ carga_i × n_i = 0 → equação balanceada
About this calculator
The Net Ionic Equation Calculator is a tool designed to help students and chemistry professionals verify the charge balance in ionic solutions. It allows you to input the concentration and charge of each ion present in the solution, automatically calculating the total net charge. The result indicates whether the solution is electrically neutral or if there is an excess of positive or negative charges.
The calculation is based on the formula Σ (charge_i × n_i) = 0, where n_i represents the amount (in moles or concentration) of ion i. The tool sums the product of each ion's charge and its quantity, and the final result should be zero for a balanced solution. Otherwise, the calculator displays the net charge value, helping to identify errors in solution preparation or stoichiometry problems.
This calculator is useful in various practical situations, such as preparing buffer solutions, verifying ionic balance in water analysis, or studying precipitation reactions. For example, when mixing NaCl and AgNO3 solutions, you can check whether the resulting ions (Na+, Cl-, Ag+, NO3-) are in charge balance. The tool is especially valuable in teaching and research laboratories where charge balance accuracy is essential.
Important precautions: ensure you enter the correct ion charges (e.g., Fe3+, not Fe+). Concentrations must be in the same unit (mol/L, mmol/L, etc.). Remember that the calculator only considers charge balance, not the formation of ion pairs or complexes. In very concentrated solutions, ionic activity effects may alter real behavior, but the tool provides a good approximation for dilute solutions.
Frequently asked questions
What does a non-zero net charge mean?
It indicates that the solution is not electrically neutral, meaning there is an excess of positive or negative charges. This can be due to errors in the entered concentrations or charges, or because the solution is indeed unbalanced (e.g., in electrochemical systems).
Can I use any concentration unit?
Yes, as long as all concentrations are in the same unit (mol/L, mmol/L, etc.). The calculator does not convert units, so maintain consistency.
Does the calculator consider ion pair formation?
No. It assumes all ions are free in solution. In high ionic strength solutions, ion pair formation can reduce effective charge, but this is not accounted for.
Why does my NaCl solution show zero charge?
Because Na+ and Cl- ions have opposite charges (+1 and -1) and, at equal concentrations, the balance is zero. This is expected for a neutral solution.
How do I input ions with fractional charges?
Use decimal values, e.g., 0.5. However, most ions have integer charges. Fractional charges may appear in some complexes, but the calculator accepts decimal numbers.