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13. When determining NaCl in sodium hydroxide solution,

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13. When determining NaCl in sodium hydroxide solution, a series of standard solutions were prepared. For this, V ml of NaCl solution (T = 0.100 mg / ml) was transferred into volumetric flasks with a capacity of 25.0 ml, reagents necessary to obtain a suspension of AgCl were added, the apparent optical densities were measured using a nephelometer and obtained:
V, ml 0.30 0.50 0.80 1.50
A each 0.670 0.550 0, Z90 1.150
A 21.74 g sample of the analyzed solution was neutralized with HN03, transferred to a volumetric flask, and 50.0 ml of solution was prepared, V1 ml of which was used to prepare 25.0 ml of AgCl suspension.
Determine the mass fraction (%) of NaCl according to the following data:
Option 1
V1 ml 2.0
And each 0.480

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