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Equipment
Potentiometer = 751 GPD Titrino / Titroprocessor
Electrodes = 6.0430.100 Ag Titrode amalgamated; input 1

Reagents
c(AgNO3) = 0.1 mol/L; D0

Sample
20 mL sample solution
5 mL c(HNO3) = 2 mol/L
30 mL dist. Water

Remarks
• Calculations:

NaCl=EP1*C01*C02*C03/C00;2;%

NaCl = content of NaCl in broth in %
C00 = sample size (10 g / 100 = 0.1 g)
C01 = molecular mass of NaCl (58.44 g/mol)
C02 = concentration of titrating agent (0.1 mol/L)
C03 = factor for conversion mL Þ L and for % (0.001*100 = 0.1)

. Answer

NaCl = 8.070 x 58.44 x 0.1 x 0.1 / 0.1 = 47.16 %

EP1 = 8.070 mL
C00 = 0.1 g

• Sample preparation:
Dissolve 10 g (1 cube) conc. broth in 800 mL boiling dist. water. Rinse this solution in a 2000 mL measuring flask. Allow to cool down and fill up to the mark. Filter with a folded filter. Take 20 mL aliquots.

Literature
• Metrohm Application Bulletin No. 130: Chloride titrations with potentiometric end-point indication.