Molecular weight of KNO3 = 101 Molecular weight of NO3 =62 To get the desired amount of NO3, multiply the weight of KNO3 by 101/62. ppm=mg/l Approximately: 1000*101/62 =1629 For better accuracy use formula weights from table.

https://en.wikipedia.org/wiki/Potassium_nitrate

• Determine the formula weight of KNO3, which is approximately 101.1 g/mol.
• Since the atomic weight of nitrogen (N) in KNO3 is approximately 14 g/mol, 100 mg of KNO3 contains 14 mg of N.
• To prepare a 1000 ppm NO3 solution, you would need 1000 mg of NO3 per liter of solution.
• Therefore, you would need to dissolve 1000 mg of KNO3 in 1 liter of water to obtain a 1000 ppm NO3 solution