How to prepare 1 litre of 150 ppm of copper 2 from the metal

Answer 1

For 150 ppm you want 150 mg/L.
Weigh 150 mg Cu metal, dissolve in dilute HNO3, add the solution to a 1 L volumetric flask, add some distilled water to the flask, swirl somewhat, add distilled water to the mark of the volumetric flask, stopper, mix thoroughly, label.