1000 ppm Na+ is the same as 1000 mg Na+ in 1.0 L of solution 1000 mg Na+ = 1.0 g Na+
But you have NaCl which will provide the Na+
What mass of NaCl is required to provide 1.0 g Na+:
Molar mass NaCl = 58.45 g/mol
Molar mass Na = 23 g/mol
Mass of NaCl required = 1.0 g Na * 58.45 g /mol NaCl / 23 g/mol Na = 2.54 g NaCl
Weigh out 2.54 g NaCl . Dissolve in distilled water and make up to a final volume of 1.0 L . You now have a 1000 ppm solution of Na+ .
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