Neutralization method

Neutralization method - a volumetric (titrimetric method of determining the concentration of acids (acidimetry) and alkalis (alkalimetry) in solutions.
The method of neutralization is the use of the neutralization, i.e. compounds of hydrogen and hydroxyl ions: N+ + HE- =N20.
When determining the acid concentration to the exact amount pipette volume of the investigated solution gradually poured from burette working solution of alkali (usually NaOH) known concentration until you change the color of the indicator, previously added to titrated solution. The volume of working solution, went to the interaction of acid, counts on a scale burette. Determination of concentration of alkali produced in a similar way, only as a work solution in this case, use the acid solution (usually HCl). The concentration of the acid or alkaline calculated by the formula ,
where V and Vp - volumes, and N, and Hp - normal concentrations are analyzed and working solutions accordingly.
During the titration of a weak acid is a strong alkali as an indicator applied usually fenolftalein, and during the titration weak alkali a strong acid - methyl orange. During the titration strong acids, strong alkalis, you can apply any of these indicators.
Method of neutralization is widely used in clinical and sanitary-hygienic laboratories. Cm. also Titration.