A portion of 2.1545 g of a sample containing sodium nitrate and various organic substances in molecular form was dissolved in 100.0 ml of water; 10.0 ml of this solution was passed through a column filled with H-form cation exchanger, and the eluent was titrated with 15.0 ml of 0.1412 mol/l sodium hydroxide solution. Calculate the content of sodium nitrate in the sample.

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