137. Solving a chemistry problem

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When determining the concentration of the electrolyte, 10.00 ml of sodium nitrate solution was placed in a volumetric flask with a capacity of 100.0 ml, brought up to the mark with water; 10.00 ml of the solution was passed through a column with a cation exchanger in the H form. The eluate and washings were collected in a beaker and titrated potentiometrically on an autotitrator with 0.1000 M sodium hydroxide solution using 2.15 ml of titrant solution. Determine the electrolyte concentration (g / l).