1. The problem statement, all variables and given/known data Predicting the products of electrolysis Ionic substances in solution break down into elements during electrolysis. Different elements are released depending on the particular ionic substance. At the negative electrode, positively charged ions gain electrons. This is reduction, and you say that the ions have been reduced. Metal ions and hydrogen ions are positively charged. Whether you get the metal or hydrogen during electrolysis depends on the position of the metal in the reactivity series: the metal will be produced if it is less reactive than hydrogen hydrogen will be produced if the metal is more reactive than hydrogen i don't understand. exactly what does metal ions have to do with hydrogen ions?