Hanna-instruments HI 904 Manual do Utilizador descarregar pdf (Página 173)

TITRATION THEORY

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5.1.9 Calculation of Titer (water equivalent of the titrant) using water

standards

C titrant Titrant Titer (mg/mL)

m sample Mass of Sample (g)

C standard Water Content of Standard (mg/g)

V titrant Volume of Titrant (mL)

5.2 Equations Used in Titrations

The main variables used in calculating a result from a titration are the sample volume, the

concentration of the titrant, and the volume of titrant required to reach the equivalence

point. At the equivalence point, an equal number of equivalents of the analyte and titrant has

been added.

5.2.1 Sample Calculation

By Mass

C sample Sample Concentration (g/100g)

V titrant Volume of titrant

C titrant Titrant Concentration (eq/L)

Ratio Equivalence ratio of analyte/ titrant (mol analyte/ eq titrant)

FW analyte Formula Weight of the Analyte (g/mol)

m sample Mass of sample (g)

By Volume

C sample Sample Concentration (g/100mL)

V titrant Volume of titrant

C titrant Titrant Concentration (eq/L)

Ratio Equivalence ratio of analyte/ titrant (mol analyte/ eq titrant)

FW analyte Formula Weight of the Analyte (g/mol)

V sample Volume of Sample (mL)

5.2.2 Standardize Titrant

Titrant standardization is the second most important calculation in titrations. A primary

standard is titrated in order to determine the concentration of the titrant. This is essentially a

typical titration calculated in “reverse”, where the concentration of the solution is known and

the titrant is unknown.

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