This follows from consideration of mass balance (the total number of each atom/molecule must remain the same) and charge balance (the sum of the electric charges before and after the reaction must be zero).
Hal ini mengikuti kaidah neraca massa (jumlah total masing-masing atom/molekul harus tetap sama) dan neraca muatan (jumlah muatan listrik sebelum dan setelah reaksi harus nol).