Preparation KNO3 solutions

Question

I need to make 1 mg-N/L, 2 mg-N/L, 4 mg-N/L, 8mg-N/L. 16mg-N/L, 32mg-N/L, 64 mg-N/L of KNO3 solutions? what would be the easiest way to prepare it?

Answer 1

If by 64 mg-N/L of KNO3, you mean a solution of KNO3 that will give you 64 mg nitrogen per liter of solution, then you would calculate the mg of KNO3 needed by

Molecular mass KNO3 / Molecular mass N x 64 mg N = mg of KNO3 to be used to make 1 liter of solution.

From this most concentrated solution, dilute a portion in half to get the 32 mg-N/L and so on until you have all the solutions you need.