EQUILIBRER DES ÉQUATIONS CHIMIQUES

This calculator uses the Gaussian elimination method to determine the stoichiometric coefficients of a chemical equation. Gaussian elimination (also known as row reduction) is a numerical method for solving a system of linear equations. The method is named after the German mathematician Carl Friedrich Gauss (1777-1855).

Every chemical equations must be balanced. What does it mean to be balanced? It means that the law of conservation of mass is obeyed. The law of conservation of mass states that in an ordinary chemical reaction, matter is neither created nor destroyed, that is, a chemical equation must have the same number of atoms of each element on both sides of the equation.

Write an unbalanced chemical equation in the input field using following rules and click 'Balance' (for example: ca3(po4)2(s) + h2so4(aq) = h3po4(aq) + caso4(s) ).

Règles pour la saisie des équations

• A valid equation must have the same elements on both sides of the equation
• Les distances entre les symboles et les formules s'ignorent, par exemple ag no3 est identique à agno3
• Tous les types des parenthèses sont corrects, par exemple Na2Zn3[Fe(CN)6]2*9H2O
• Lors de l'écriture les ions, ajoutez simplement la charge à la fin, par exemple: Al3+, NH4+, SO42- ou Hg2^2+
• Comme flèche, vous pouvez écrire dans l'équation "=" ou "-->" ou "→"
• Vous pouvez écrire l'ensemble de l'équation en minuscules. Les éléments correctement écrits (première lettre majuscule) le convertisseur laissera inchangés, comme vous les avez écrits.
• To indicate the physical states you can use (s) for solid, (l) for liquids, (g) for gases, and (aq) for substances dissolved in water.

Exemples d'équations chimiques

Equilibrage des réactions d'oxydoréduction

Two problems can occur when balancing redox reactions with mathematical methods:

1. Balancing equations of redox reactions by inspection or with a mathematical method (such as Gauss's elimination method) can create results that are mathematically accurate, but not chemically. This is because equations of redox reactions must also satisfy the electron balance, i.e. the number of electrons released in the oxidation reaction must be equal to the number of electrons recieved in the reduction reaction.

2. Redox equations are often written in such a way that water and its ions are left out. H2O, H+ or OH- (depending on the medium) can be added as necessary since its assumed the reaction occurs in water. Contrary to that, the mathematical method requires that all species participating in the reaction are explicitly stated.