7. A sample of sodium nitrate and indifferent impurities in a molecular form, weighing 1.5174 g, was dissolved in 100.0 ml of water. 10.00 ml of the resulting solution was passed through a column with cationitis in the N-form and 15.00 ml of 0.1110 m of the sodium hydroxide solution was used to titration of eliant. Calculate the mass fraction of sodium nitrate in the sample. Write an ion exchange reaction to Cationitis.

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