Fajan's method of titration uses the reaction that occurs between the precipitate and the indicator during titration. The surface of colloidal AgCl absorbs fluorescein and its derivatives. The first drop of Ag+, following the use of all of the chloride, reacts with fluorescein resulting in a reddish color.Know More
Scientists use a dye for an indicator, such as dichlorofluorescein, and it is an anion in solution. Anions are groups of atoms or single atoms with gained electrons. Chloride ions are excessive in a chloride solution, so they are responsible for the formation of the primary layer on the precipitate someone uses, with the second layer being the cations of sodium. Cations are a group of ions or individual ions that have a positive charge. During electrolysis, they always tend to move toward the negative electrode.
At the end point, or the completion of the reaction, the silver ion is excessive. This results in the primary layer now being silver ion. It attracts the indicator's ions because it now has a positive charge and forms the secondary layer. When comparing the absorbed indicator and the free indicator, the color is different. This gives scientists a visible end point so that they know when the reaction is complete.Learn more about Chemistry
Titration is a common method used to determine the concentration or amount of an unknown substance. Chemicool defines a primary standard titration as an extremely pure reagent that has no waters of hydration and that has a relatively higher molecular weight. In most cases, it is used as a standardization solution.Full Answer >
One of the most common types of complexometric titrations involves using EDTA as the testing reagent. Other chelating agents such as EGTA and CDTA can be used. A specific metal ion titrant and indicator can be used in some titrations when a specific ion is tested for.Full Answer >
A double indicator titration is the process used in chemistry experiments to determine and analyze the amount and concentration of acids or bases in a solution at two end points. For example, when titrating sodium carbonate, hydrocholoric acid is added to form sodium hydroxide, the first endpoint, and then hydrochloric acid is added again to form carbonic acid, the second endpoint.Full Answer >
The titration reaction between potassium permanganate, the acid in the reaction, and sodium oxalate, the base, is conducted slowly so that the equivalence point of the neutralization reaction can be accurately determined. When the sodium oxalate is added to potassium permanganate, excess acid remains in the bottom flask until the equivalence point is reached. At the equivalence point, the acid-base indicator changes color and the acid is effectively neutralized.Full Answer >