The observations that led to this pH value can be found in the table above. Once the colors were observed, the observations were compared to those of the previous salts to help determine the overall pH. The unknown salt had very similar colors to ZnCl2 for each indicator, so the pH range was based around the same values. Hydrolysis of salts can be determined based on the strength of the acid or base that forms it. If the salt is made up of a strong acid and a strong base, such as NaCl, the salt will form a neutral solution, since the anions of the acid and the cations of the base will not react with water. A salt made from a weak base and a strong acid, with NH4Cl as an example, will form an acidic solution. This is due to the cations of the base which increase the concentration of hydrogen ions, giving protons, called Bronsted acids. When it is a salt made of a weak acid and a strong base, such as Na C2H3O2, a basic solution will form. Anions of a weak acid in water will generate hydroxide ions, since the molecule will accept protons. It is called the Bronsted base. Although no examples were present, the salt formed from a weak acid and a weak base can be determined by comparing the Ka (cation) and Kb (anion) values. Most metal ions, those found in groups 1A and 2A of the periodic table, such as Ca2+, a strong base, will have no reaction with water. However, all other metal ions will undergo hydrolysis to form an acidic solution, such as KAl(SO4)2. As Al is the molecule that was hydrolyzed, spectator ions would not be present in the hydrolysis reaction, as shown by the net ionic equations.